diff --git a/eng/pipelines/extra-platforms/runtime-extra-platforms-wasm.yml b/eng/pipelines/extra-platforms/runtime-extra-platforms-wasm.yml
index c641821da3855a..ed31b829c0ce68 100644
--- a/eng/pipelines/extra-platforms/runtime-extra-platforms-wasm.yml
+++ b/eng/pipelines/extra-platforms/runtime-extra-platforms-wasm.yml
@@ -112,13 +112,13 @@ jobs:
         - browser_wasm
         #- browser_wasm_win
       nameSuffix: _Threading
-      extraBuildArgs: /p:MonoWasmBuildVariant=multithread /p:WasmEnableThreads=true /p:_WasmPThreadPoolSize=8 /p:AotHostArchitecture=x64 /p:AotHostOS=$(_hostedOS)
+      extraBuildArgs: /p:MonoWasmBuildVariant=multithread /p:WasmEnableThreads=true /p:AotHostArchitecture=x64 /p:AotHostOS=$(_hostedOS)
       isExtraPlatformsBuild: ${{ parameters.isExtraPlatformsBuild }}
       isWasmOnlyBuild: ${{ parameters.isWasmOnlyBuild }}
       # Always run for runtime-wasm because tests are not run in runtime
       alwaysRun: ${{ parameters.isWasmOnlyBuild }}
 
-       # NOTE - Since threading is experimental, we don't want to block mainline work
+      # NOTE - Since threading is experimental, we don't want to block mainline work
       shouldContinueOnError: true
       scenarios:
         - WasmTestOnBrowser
@@ -198,7 +198,7 @@ jobs:
         - browser_wasm
         - browser_wasm_win
       nameSuffix: MultiThreaded
-      extraBuildArgs: /p:MonoWasmBuildVariant=multithread /p:WasmEnableThreads=true /p:_WasmPThreadPoolSize=8 /p:AotHostArchitecture=x64 /p:AotHostOS=$(_hostedOS)
+      extraBuildArgs: /p:MonoWasmBuildVariant=multithread /p:WasmEnableThreads=true /p:AotHostArchitecture=x64 /p:AotHostOS=$(_hostedOS)
       condition: ne(variables['wasmMultiThreadedBuildOnlyNeededOnDefaultPipeline'], true)
       publishArtifactsForWorkload: true
       publishWBT: false
@@ -262,6 +262,7 @@ jobs:
       isExtraPlatformsBuild: ${{ parameters.isExtraPlatformsBuild }}
       isWasmOnlyBuild: ${{ parameters.isWasmOnlyBuild }}
       runOnlyOnWasmOnlyPipelines: true
+      shouldContinueOnError: true
 
   # Disable for now
   #- template: /eng/pipelines/coreclr/perf-wasm-jobs.yml
diff --git a/eng/pipelines/runtime.yml b/eng/pipelines/runtime.yml
index fc8b0ad617ebc1..d06566403f3ed1 100644
--- a/eng/pipelines/runtime.yml
+++ b/eng/pipelines/runtime.yml
@@ -566,7 +566,7 @@ extends:
             - browser_wasm_win
           condition: or(eq(variables.isRollingBuild, true), eq(variables.wasmSingleThreadedBuildOnlyNeededOnDefaultPipeline, true))
           nameSuffix: MultiThreaded
-          extraBuildArgs: /p:MonoWasmBuildVariant=multithread /p:WasmEnableThreads=true /p:_WasmPThreadPoolSize=8 /p:AotHostArchitecture=x64 /p:AotHostOS=$(_hostedOS)
+          extraBuildArgs: /p:MonoWasmBuildVariant=multithread /p:WasmEnableThreads=true /p:AotHostArchitecture=x64 /p:AotHostOS=$(_hostedOS)
           publishArtifactsForWorkload: true
           publishWBT: false
 
@@ -602,7 +602,7 @@ extends:
           platforms:
             - browser_wasm
           nameSuffix: _Threading_Smoke
-          extraBuildArgs: /p:MonoWasmBuildVariant=multithread /p:_WasmPThreadPoolSize=8 /p:AotHostArchitecture=x64 /p:AotHostOS=$(_hostedOS)
+          extraBuildArgs: /p:MonoWasmBuildVariant=multithread /p:AotHostArchitecture=x64 /p:AotHostOS=$(_hostedOS)
           shouldRunSmokeOnly: true
           alwaysRun: ${{ variables.isRollingBuild }}
           scenarios:
diff --git a/src/libraries/Common/tests/System/TimeProviderTests.cs b/src/libraries/Common/tests/System/TimeProviderTests.cs
index 5b381d190946de..269ed251b3785d 100644
--- a/src/libraries/Common/tests/System/TimeProviderTests.cs
+++ b/src/libraries/Common/tests/System/TimeProviderTests.cs
@@ -109,7 +109,6 @@ public static IEnumerable<object[]> TimersProvidersData()
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [MemberData(nameof(TimersProvidersData))]
         public void TestProviderTimer(TimeProvider provider, int MaxMilliseconds)
         {
@@ -216,7 +215,6 @@ private static void CancelAfter(TimeProvider provider, CancellationTokenSource c
 #endif // NETFRAMEWORK
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [MemberData(nameof(TimersProvidersListData))]
         public static void CancellationTokenSourceWithTimer(TimeProvider provider)
         {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.EnvironmentVariables/tests/EnvironmentVariablesTest.cs b/src/libraries/Microsoft.Extensions.Configuration.EnvironmentVariables/tests/EnvironmentVariablesTest.cs
index cd03e816fb6568..bf74d11775dcfe 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.EnvironmentVariables/tests/EnvironmentVariablesTest.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.EnvironmentVariables/tests/EnvironmentVariablesTest.cs
@@ -284,7 +284,6 @@ public void AddEnvironmentVariablesUsingPrefixWithDoubleUnderscores_Bind_PrefixM
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void BindingDoesNotThrowIfReloadedDuringBinding()
         {
             var dic = new Dictionary<string, string>
diff --git a/src/libraries/Microsoft.Extensions.Configuration/tests/FunctionalTests/ConfigurationTests.cs b/src/libraries/Microsoft.Extensions.Configuration/tests/FunctionalTests/ConfigurationTests.cs
index cc5a7df5421417..ced9dd64c3007a 100644
--- a/src/libraries/Microsoft.Extensions.Configuration/tests/FunctionalTests/ConfigurationTests.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration/tests/FunctionalTests/ConfigurationTests.cs
@@ -286,7 +286,6 @@ public void LoadAndCombineKeyValuePairsFromDifferentConfigurationProvidersWithAb
         }
 
         [Fact]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void CanOverrideValuesWithNewConfigurationProvider()
         {
             WriteTestFiles();
@@ -941,7 +940,6 @@ await WaitForChange(
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void BindingDoesNotThrowIfReloadedDuringBinding()
         {
             WriteTestFiles();
diff --git a/src/libraries/Microsoft.Extensions.Http/tests/Microsoft.Extensions.Http.Tests/DependencyInjection/HttpClientFactoryServiceCollectionExtensionsTest.cs b/src/libraries/Microsoft.Extensions.Http/tests/Microsoft.Extensions.Http.Tests/DependencyInjection/HttpClientFactoryServiceCollectionExtensionsTest.cs
index fab5ad4fc1fdc9..c72b17e728848d 100644
--- a/src/libraries/Microsoft.Extensions.Http/tests/Microsoft.Extensions.Http.Tests/DependencyInjection/HttpClientFactoryServiceCollectionExtensionsTest.cs
+++ b/src/libraries/Microsoft.Extensions.Http/tests/Microsoft.Extensions.Http.Tests/DependencyInjection/HttpClientFactoryServiceCollectionExtensionsTest.cs
@@ -1204,7 +1204,6 @@ public async Task AddHttpClient_MessageHandler_Scope_TransientDependency()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported), nameof(PlatformDetection.IsReflectionEmitSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddHttpClient_GetAwaiterAndResult_InSingleThreadedSynchronizationContext_ShouldNotHangs()
         {
             // Arrange
@@ -1368,7 +1367,7 @@ public void SuppressScope_True_InScope_DoesNotCreateScope()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91673", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
+        [SkipOnPlatform(TestPlatforms.Browser, "Credentials is not supported on Browser")]
         public void AddHttpClient_ConfigurePrimaryHttpMessageHandler_ApplyChangesPrimaryHandler()
         {
             // Arrange
diff --git a/src/libraries/Microsoft.Extensions.Logging.Console/tests/Microsoft.Extensions.Logging.Console.Tests/ConsoleLoggerExtensionsTests.cs b/src/libraries/Microsoft.Extensions.Logging.Console/tests/Microsoft.Extensions.Logging.Console.Tests/ConsoleLoggerExtensionsTests.cs
index 945f00905c8e36..99b49170ed8e1d 100644
--- a/src/libraries/Microsoft.Extensions.Logging.Console/tests/Microsoft.Extensions.Logging.Console.Tests/ConsoleLoggerExtensionsTests.cs
+++ b/src/libraries/Microsoft.Extensions.Logging.Console/tests/Microsoft.Extensions.Logging.Console.Tests/ConsoleLoggerExtensionsTests.cs
@@ -76,7 +76,6 @@ public void AddConsoleFormatter_NullConfigure_Throws()
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [MemberData(nameof(FormatterNames))]
         public void AddConsole_ConsoleLoggerOptionsFromConfigFile_IsReadFromLoggingConfiguration(string formatterName)
         {
@@ -156,7 +155,6 @@ private class CustomOptions : ConsoleFormatterOptions
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddSimpleConsole_ChangeProperties_IsReadFromLoggingConfiguration()
         {
             var configuration = new ConfigurationBuilder().AddInMemoryCollection(new[] {
@@ -187,7 +185,6 @@ public void AddSimpleConsole_ChangeProperties_IsReadFromLoggingConfiguration()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddSimpleConsole_OutsideConfig_TakesProperty()
         {
             var configuration = new ConfigurationBuilder().AddInMemoryCollection(new[] {
@@ -218,7 +215,6 @@ public void AddSimpleConsole_OutsideConfig_TakesProperty()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddSystemdConsole_ChangeProperties_IsReadFromLoggingConfiguration()
         {
             var configuration = new ConfigurationBuilder().AddInMemoryCollection(new[] {
@@ -245,7 +241,6 @@ public void AddSystemdConsole_ChangeProperties_IsReadFromLoggingConfiguration()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddSystemdConsole_OutsideConfig_TakesProperty()
         {
             var configuration = new ConfigurationBuilder().AddInMemoryCollection(new[] {
@@ -276,7 +271,6 @@ public void AddSystemdConsole_OutsideConfig_TakesProperty()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddJsonConsole_ChangeProperties_IsReadFromLoggingConfiguration()
         {
             var configuration = new ConfigurationBuilder().AddInMemoryCollection(new[] {
@@ -305,7 +299,6 @@ public void AddJsonConsole_ChangeProperties_IsReadFromLoggingConfiguration()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddJsonConsole_OutsideConfig_TakesProperty()
         {
             var configuration = new ConfigurationBuilder().AddInMemoryCollection(new[] {
@@ -340,7 +333,6 @@ public void AddJsonConsole_OutsideConfig_TakesProperty()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddConsole_NullFormatterNameUsingSystemdFormat_AnyDeprecatedPropertiesOverwriteFormatterOptions()
         {
             var configs = new[] {
@@ -386,7 +378,6 @@ public void AddConsole_MaxQueueLengthSetToNegativeOrZero_Throws(int invalidMaxQu
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddConsole_MaxQueueLengthLargerThanZero_ConfiguredProperly()
         {
             var configs = new[] {
@@ -408,7 +399,6 @@ public void AddConsole_MaxQueueLengthLargerThanZero_ConfiguredProperly()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddConsole_NullFormatterName_UsingSystemdFormat_IgnoreFormatterOptionsAndUseDeprecatedInstead()
         {
             var configuration = new ConfigurationBuilder().AddInMemoryCollection(new[] {
@@ -441,7 +431,6 @@ public void AddConsole_NullFormatterName_UsingSystemdFormat_IgnoreFormatterOptio
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AddConsole_NullFormatterName_UsingDefaultFormat_IgnoreFormatterOptionsAndUseDeprecatedInstead()
         {
             var configuration = new ConfigurationBuilder().AddInMemoryCollection(new[] {
@@ -481,7 +470,6 @@ public void AddConsole_NullFormatterName_UsingDefaultFormat_IgnoreFormatterOptio
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [InlineData("missingFormatter")]
         [InlineData("simple")]
         [InlineData("Simple")]
@@ -525,7 +513,6 @@ public void AddConsole_FormatterNameIsSet_UsingDefaultFormat_IgnoreDeprecatedAnd
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [InlineData("missingFormatter")]
         [InlineData("systemd")]
         [InlineData("Systemd")]
diff --git a/src/libraries/Microsoft.Extensions.Logging.Console/tests/Microsoft.Extensions.Logging.Console.Tests/ConsoleLoggerProcessorTests.cs b/src/libraries/Microsoft.Extensions.Logging.Console/tests/Microsoft.Extensions.Logging.Console.Tests/ConsoleLoggerProcessorTests.cs
index 618d4cc9fb84f7..dfc7eaae8fe24c 100644
--- a/src/libraries/Microsoft.Extensions.Logging.Console/tests/Microsoft.Extensions.Logging.Console.Tests/ConsoleLoggerProcessorTests.cs
+++ b/src/libraries/Microsoft.Extensions.Logging.Console/tests/Microsoft.Extensions.Logging.Console.Tests/ConsoleLoggerProcessorTests.cs
@@ -15,7 +15,6 @@ public class ConsoleLoggerProcessorTests
         private const string _loggerName = "test";
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void LogAfterDisposeWritesLog()
         {
             // Arrange
@@ -64,7 +63,6 @@ public void LogsFlushedAfterDispose()
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [InlineData(-1)]
         [InlineData(0)]
         public static void MaxQueueLength_SetInvalid_Throws(int invalidMaxQueueLength)
diff --git a/src/libraries/System.Collections.NonGeneric/tests/QueueTests.cs b/src/libraries/System.Collections.NonGeneric/tests/QueueTests.cs
index 69a09d473bedc1..56b509470e8224 100644
--- a/src/libraries/System.Collections.NonGeneric/tests/QueueTests.cs
+++ b/src/libraries/System.Collections.NonGeneric/tests/QueueTests.cs
@@ -913,7 +913,6 @@ public static void Synchronized()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void SynchronizedEnqueue()
         {
             // Enqueue
diff --git a/src/libraries/System.ComponentModel.TypeConverter/tests/TimerTests.cs b/src/libraries/System.ComponentModel.TypeConverter/tests/TimerTests.cs
index ff4138d6cc6f0a..0904d7145912ea 100644
--- a/src/libraries/System.ComponentModel.TypeConverter/tests/TimerTests.cs
+++ b/src/libraries/System.ComponentModel.TypeConverter/tests/TimerTests.cs
@@ -36,7 +36,6 @@ public void Ctor_PropertiesMatchExpectedDefaults()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void TestTimerStartAutoReset()
         {
             using (var timer = new TestTimer(1))
diff --git a/src/libraries/System.Composition/tests/ConcurrencyTests.cs b/src/libraries/System.Composition/tests/ConcurrencyTests.cs
index e015c15cb23308..6801f55a57d32e 100644
--- a/src/libraries/System.Composition/tests/ConcurrencyTests.cs
+++ b/src/libraries/System.Composition/tests/ConcurrencyTests.cs
@@ -28,7 +28,6 @@ public void OnImportsSatisfied()
         // This does not test the desired behaviour deterministically,
         // but is close enough to be repeatable at least on my machine :)
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void SharedInstancesAreNotVisibleUntilActivationCompletes()
         {
             var c = CreateContainer(typeof(PausesDuringActivation));
diff --git a/src/libraries/System.Globalization/tests/CultureInfo/CultureInfoAsync.cs b/src/libraries/System.Globalization/tests/CultureInfo/CultureInfoAsync.cs
index 3f7131ad8db332..1e9eb7b7555bc8 100644
--- a/src/libraries/System.Globalization/tests/CultureInfo/CultureInfoAsync.cs
+++ b/src/libraries/System.Globalization/tests/CultureInfo/CultureInfoAsync.cs
@@ -30,7 +30,6 @@ public void TestCurrentCulturesAsync()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void TestCurrentCulturesWithAwait()
         {
             var newCurrentCulture = new CultureInfo(CultureInfo.CurrentCulture.Name.Equals("ja-JP", StringComparison.OrdinalIgnoreCase) ? "en-US" : "ja-JP");
diff --git a/src/libraries/System.IO.Pipelines/tests/SchedulerFacts.cs b/src/libraries/System.IO.Pipelines/tests/SchedulerFacts.cs
index 42b92efbc1369c..ba558339b0a057 100644
--- a/src/libraries/System.IO.Pipelines/tests/SchedulerFacts.cs
+++ b/src/libraries/System.IO.Pipelines/tests/SchedulerFacts.cs
@@ -181,7 +181,6 @@ public async Task DefaultReaderSchedulerIgnoresSyncContextIfConfigureAwaitFalse(
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public async Task DefaultReaderSchedulerRunsOnThreadPool()
         {
             var pipe = new Pipe(new PipeOptions(useSynchronizationContext: false));
@@ -211,7 +210,6 @@ public async Task DefaultReaderSchedulerRunsOnThreadPool()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public async Task DefaultWriterSchedulerRunsOnThreadPool()
         {
             using (var pool = new TestMemoryPool())
@@ -413,7 +411,6 @@ public async Task DefaultWriterSchedulerIgnoresSynchronizationContext()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public async Task FlushCallbackRunsOnWriterScheduler()
         {
             using (var pool = new TestMemoryPool())
@@ -459,7 +456,6 @@ public async Task FlushCallbackRunsOnWriterScheduler()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public async Task ReadAsyncCallbackRunsOnReaderScheduler()
         {
             using (var pool = new TestMemoryPool())
@@ -493,7 +489,6 @@ public async Task ReadAsyncCallbackRunsOnReaderScheduler()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public async Task ThreadPoolScheduler_SchedulesOnThreadPool()
         {
             var pipe = new Pipe(new PipeOptions(readerScheduler: PipeScheduler.ThreadPool, writerScheduler: PipeScheduler.Inline, useSynchronizationContext: false));
diff --git a/src/libraries/System.Linq.Parallel/tests/ExchangeTests.cs b/src/libraries/System.Linq.Parallel/tests/ExchangeTests.cs
index 3f12e3e34c0027..6dcaffbf60a5a5 100644
--- a/src/libraries/System.Linq.Parallel/tests/ExchangeTests.cs
+++ b/src/libraries/System.Linq.Parallel/tests/ExchangeTests.cs
@@ -89,7 +89,6 @@ public static IEnumerable<object[]> AllMergeOptions_Multiple()
         // or WithMergeOptions
 
         [ConditionalTheory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [MemberData(nameof(PartitioningData), new[] { 0, 1, 2, 16, 1024 })]
         public static void Partitioning_Default(Labeled<ParallelQuery<int>> labeled, int count, int partitions)
         {
@@ -159,7 +158,6 @@ public static void Merge_Ordered_Longrunning(Labeled<ParallelQuery<int>> labeled
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [MemberData(nameof(ThrowOnCount_AllMergeOptions_MemberData), new[] { 4, 8 })]
         // FailingMergeData has enumerables that throw errors when attempting to perform the nth enumeration.
         // This test checks whether the query runs in a pipelined or buffered fashion.
@@ -169,7 +167,6 @@ public static void Merge_Ordered_Pipelining(Labeled<ParallelQuery<int>> labeled,
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [MemberData(nameof(MergeData), new[] { 4, 8 })]
         // This test checks whether the query runs in a pipelined or buffered fashion.
         public static void Merge_Ordered_Pipelining_Select(Labeled<ParallelQuery<int>> labeled, int count, ParallelMergeOptions options)
diff --git a/src/libraries/System.Linq.Parallel/tests/QueryOperators/GetEnumeratorTests.cs b/src/libraries/System.Linq.Parallel/tests/QueryOperators/GetEnumeratorTests.cs
index 652c72897980da..d34cc6e903bc9c 100644
--- a/src/libraries/System.Linq.Parallel/tests/QueryOperators/GetEnumeratorTests.cs
+++ b/src/libraries/System.Linq.Parallel/tests/QueryOperators/GetEnumeratorTests.cs
@@ -165,7 +165,6 @@ public static void GetEnumerator_MoveNextAfterEnd(Labeled<ParallelQuery<int>> la
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void GetEnumerator_LargeQuery_PauseAfterOpening()
         {
             using (IEnumerator<int> e = Enumerable.Range(0, 8192).AsParallel().SkipWhile(i => true).GetEnumerator())
diff --git a/src/libraries/System.Linq.Parallel/tests/QueryOperators/OrderByThenByTests.cs b/src/libraries/System.Linq.Parallel/tests/QueryOperators/OrderByThenByTests.cs
index 931333fd69b536..0d920b5d13f782 100644
--- a/src/libraries/System.Linq.Parallel/tests/QueryOperators/OrderByThenByTests.cs
+++ b/src/libraries/System.Linq.Parallel/tests/QueryOperators/OrderByThenByTests.cs
@@ -517,7 +517,6 @@ public static void OrderBy_ThreadedDeadlock(Labeled<ParallelQuery<int>> labeled,
         // Heavily exercises OrderBy, but only throws one user delegate exception to simulate an occasional failure.
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         [MemberData(nameof(OrderByThreadedData), new[] { 1, 2, 16, 128, 1024 }, new[] { 1, 2, 4, 7, 8, 31, 32 })]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void OrderBy_ThreadedDeadlock_SingleException(Labeled<ParallelQuery<int>> labeled, int count, int degree)
         {
             int countdown = Math.Min(count / 2, degree) + 1;
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/System.Net.Http.Functional.Tests.csproj b/src/libraries/System.Net.Http/tests/FunctionalTests/System.Net.Http.Functional.Tests.csproj
index fdb94e9caff24d..d0283202019b22 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/System.Net.Http.Functional.Tests.csproj
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/System.Net.Http.Functional.Tests.csproj
@@ -25,7 +25,6 @@
     <TestArchiveTestsDir>$(TestArchiveTestsRoot)$(OSPlatformConfig)/</TestArchiveTestsDir>
     <DefineConstants>$(DefineConstants);TARGET_BROWSER</DefineConstants>
     <WasmXHarnessMonoArgs>--setenv=XHARNESS_LOG_TEST_START=true --no-memory-snapshot</WasmXHarnessMonoArgs>
-    <_WasmPThreadPoolSize Condition="'$(MonoWasmBuildVariant)' == 'multithread'">10</_WasmPThreadPoolSize>
     <!-- This WASM test is problematic and slow right now. This sets the xharness timeout but there is also override in sendtohelix-wasm.targets -->
     <WasmXHarnessTestsTimeout>01:15:00</WasmXHarnessTestsTimeout>
   </PropertyGroup>
diff --git a/src/libraries/System.Net.WebSockets.Client/tests/System.Net.WebSockets.Client.Tests.csproj b/src/libraries/System.Net.WebSockets.Client/tests/System.Net.WebSockets.Client.Tests.csproj
index f683a4bcf3d949..fe0d13c9526231 100644
--- a/src/libraries/System.Net.WebSockets.Client/tests/System.Net.WebSockets.Client.Tests.csproj
+++ b/src/libraries/System.Net.WebSockets.Client/tests/System.Net.WebSockets.Client.Tests.csproj
@@ -14,7 +14,6 @@
     <TestArchiveTestsDir>$(TestArchiveTestsRoot)$(OSPlatformConfig)/</TestArchiveTestsDir>
     <DefineConstants>$(DefineConstants);TARGET_BROWSER</DefineConstants>
     <WasmXHarnessMonoArgs>--setenv=XHARNESS_LOG_TEST_START=true --no-memory-snapshot</WasmXHarnessMonoArgs>
-    <_WasmPThreadPoolSize Condition="'$(MonoWasmBuildVariant)' == 'multithread'">10</_WasmPThreadPoolSize>
 
     <!-- This WASM test is problematic and slow right now. This sets the xharness timeout but there is also override in sendtohelix-wasm.targets -->
     <WasmXHarnessTestsTimeout>01:15:00</WasmXHarnessTestsTimeout>
diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.cs
index db49ea2c5a5a92..51142edb03ce57 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.cs
@@ -17,7 +17,9 @@ internal sealed partial class PortableThreadPool
 
         private const short MaxPossibleThreadCount = short.MaxValue;
 
-#if TARGET_64BIT
+#if TARGET_BROWSER
+        private const short DefaultMaxWorkerThreadCount = 10;
+#elif TARGET_64BIT
         private const short DefaultMaxWorkerThreadCount = MaxPossibleThreadCount;
 #elif TARGET_32BIT
         private const short DefaultMaxWorkerThreadCount = 1023;
diff --git a/src/libraries/System.Private.Xml/tests/System.Private.Xml.Tests.csproj b/src/libraries/System.Private.Xml/tests/System.Private.Xml.Tests.csproj
index 248c92b2e90c98..e0dbfa21eec93c 100644
--- a/src/libraries/System.Private.Xml/tests/System.Private.Xml.Tests.csproj
+++ b/src/libraries/System.Private.Xml/tests/System.Private.Xml.Tests.csproj
@@ -14,6 +14,7 @@
     <TestArchiveTestsRoot>$(TestArchiveRoot)browserornodejs/</TestArchiveTestsRoot>
     <TestArchiveTestsDir>$(TestArchiveTestsRoot)$(OSPlatformConfig)/</TestArchiveTestsDir>
     <DefineConstants>$(DefineConstants);TARGET_BROWSER</DefineConstants>
+    <WasmXHarnessMonoArgs>--setenv=XHARNESS_LOG_TEST_START=true --no-memory-snapshot</WasmXHarnessMonoArgs>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/libraries/System.Private.Xml/tests/Xslt/XslCompiledTransformApi/XslTransformMultith.cs b/src/libraries/System.Private.Xml/tests/Xslt/XslCompiledTransformApi/XslTransformMultith.cs
index f8d12d5dec8acf..5699868c280638 100644
--- a/src/libraries/System.Private.Xml/tests/Xslt/XslCompiledTransformApi/XslTransformMultith.cs
+++ b/src/libraries/System.Private.Xml/tests/Xslt/XslCompiledTransformApi/XslTransformMultith.cs
@@ -78,7 +78,6 @@ public int Transform(object args)
 
         //[Variation("Multiple Transform(): Reader - Basic Test")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc1()
         {
             Load("xslt_multithreading_test.xsl", "foo.xml");
@@ -99,7 +98,6 @@ public void proc1()
 
         //[Variation("Multiple Transform(): Reader - QFE 505 Repro")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc2()
         {
             using (new AllowDefaultResolverContext())
@@ -121,7 +119,6 @@ public void proc2()
 
         //[Variation("Multiple Transform(): Reader - AVTs")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc3()
         {
             Load("xslt_multith_AVTs.xsl", "xslt_multith_AVTs.xml");
@@ -142,7 +139,6 @@ public void proc3()
 
         //[Variation("Multiple Transform(): Reader - xsl:key")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc4()
         {
             Load("xslt_multith_keytest.xsl", "xslt_multith_keytest.xml");
@@ -163,7 +159,6 @@ public void proc4()
 
         //[Variation("Multiple Transform(): Reader - xsl:sort")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc5()
         {
             Load("xslt_multith_sorting.xsl", "xslt_multith_sorting.xml");
@@ -184,7 +179,6 @@ public void proc5()
 
         //[Variation("Multiple Transform(): Reader - Attribute Sets")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc6()
         {
             Load("xslt_mutith_attribute_sets.xsl", "xslt_mutith_attribute_sets.xml");
@@ -205,7 +199,6 @@ public void proc6()
 
         //[Variation("Multiple Transform(): Reader - Boolean Expression AND")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc7()
         {
             Load("xslt_mutith_boolean_expr_and.xsl", "xslt_mutith_boolean_expr_and.xml");
@@ -226,7 +219,6 @@ public void proc7()
 
         //[Variation("Multiple Transform(): Reader - Boolean Expression OR")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc8()
         {
             Load("xslt_mutith_boolean_expr_or.xsl", "xslt_mutith_boolean_expr_or.xml");
@@ -247,7 +239,6 @@ public void proc8()
 
         //[Variation("Multiple Transform(): Reader - FormatNumber function")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc9()
         {
             Load("xslt_mutith_format_number.xsl", "xslt_mutith_format_number.xml");
@@ -268,7 +259,6 @@ public void proc9()
 
         //[Variation("Multiple Transform(): Reader - Position() function")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc10()
         {
             Load("xslt_mutith_position_func.xsl", "xslt_mutith_position_func.xml");
@@ -289,7 +279,6 @@ public void proc10()
 
         //[Variation("Multiple Transform(): Reader - preserve space")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc11()
         {
             Load("xslt_mutith_preserve_space.xsl", "xslt_mutith_preserve_space.xml");
@@ -310,7 +299,6 @@ public void proc11()
 
         //[Variation("Multiple Transform(): Reader - Variable nodeset")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc12()
         {
             Load("xslt_mutith_variable_nodeset.xsl", "xslt_mutith_variable_nodeset.xml");
@@ -377,7 +365,6 @@ private void Load(string _strXslFile, string _strXmlFile)
 
         //[Variation("Multiple Transform(): TextWriter - Basic Test")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc1()
         {
             Load("xslt_multithreading_test.xsl", "foo.xml");
@@ -398,7 +385,6 @@ public void proc1()
 
         //[Variation("Multiple Transform(): TextWriter - QFE 505 Repro")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc2()
         {
             using (new AllowDefaultResolverContext())
@@ -420,7 +406,6 @@ public void proc2()
 
         //[Variation("Multiple Transform(): TextWriter - AVTs")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc3()
         {
             Load("xslt_multith_AVTs.xsl", "xslt_multith_AVTs.xml");
@@ -441,7 +426,6 @@ public void proc3()
 
         //[Variation("Multiple Transform(): TextWriter - xsl:key")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc4()
         {
             Load("xslt_multith_keytest.xsl", "xslt_multith_keytest.xml");
@@ -462,7 +446,6 @@ public void proc4()
 
         //[Variation("Multiple Transform(): TextWriter - xsl:sort")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc5()
         {
             Load("xslt_multith_sorting.xsl", "xslt_multith_sorting.xml");
@@ -483,7 +466,6 @@ public void proc5()
 
         //[Variation("Multiple Transform(): TextWriter - Attribute Sets")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc6()
         {
             Load("xslt_mutith_attribute_sets.xsl", "xslt_mutith_attribute_sets.xml");
@@ -504,7 +486,6 @@ public void proc6()
 
         //[Variation("Multiple Transform(): TextWriter - Boolean Expression AND")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc7()
         {
             Load("xslt_mutith_boolean_expr_and.xsl", "xslt_mutith_boolean_expr_and.xml");
@@ -525,7 +506,6 @@ public void proc7()
 
         //[Variation("Multiple Transform(): TextWriter - Boolean Expression OR")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc8()
         {
             Load("xslt_mutith_boolean_expr_or.xsl", "xslt_mutith_boolean_expr_or.xml");
@@ -546,7 +526,6 @@ public void proc8()
 
         //[Variation("Multiple Transform(): TextWriter - FormatNumber function")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc9()
         {
             Load("xslt_mutith_format_number.xsl", "xslt_mutith_format_number.xml");
@@ -567,7 +546,6 @@ public void proc9()
 
         //[Variation("Multiple Transform(): TextWriter - Position() function")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc10()
         {
             Load("xslt_mutith_position_func.xsl", "xslt_mutith_position_func.xml");
@@ -588,7 +566,6 @@ public void proc10()
 
         //[Variation("Multiple Transform(): TextWriter - preserve space")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc11()
         {
             Load("xslt_mutith_preserve_space.xsl", "xslt_mutith_preserve_space.xml");
@@ -609,7 +586,6 @@ public void proc11()
 
         //[Variation("Multiple Transform(): TextWriter - Variable nodeset")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc12()
         {
             Load("xslt_mutith_variable_nodeset.xsl", "xslt_mutith_variable_nodeset.xml");
diff --git a/src/libraries/System.Private.Xml/tests/Xslt/XslCompiledTransformApi/XsltArgumentListMultith.cs b/src/libraries/System.Private.Xml/tests/Xslt/XslCompiledTransformApi/XsltArgumentListMultith.cs
index 920cf4a1d01453..bfa3788d0c9072 100644
--- a/src/libraries/System.Private.Xml/tests/Xslt/XslCompiledTransformApi/XsltArgumentListMultith.cs
+++ b/src/libraries/System.Private.Xml/tests/Xslt/XslCompiledTransformApi/XsltArgumentListMultith.cs
@@ -105,7 +105,6 @@ public int GetParam2(object args)
 
         //[Variation("Multiple GetParam for same parameter name")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc1()
         {
             CThreads rThreads = new CThreads(_output);
@@ -124,7 +123,6 @@ public void proc1()
 
         //[Variation("Multiple GetParam for different parameter name")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc2()
         {
             CThreads rThreads = new CThreads(_output);
@@ -192,7 +190,6 @@ public int GetExtnObject2(object args)
 
         //[Variation("Multiple GetExtensionObject for same namespace System.Xml.Tests")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc1()
         {
             CThreads rThreads = new CThreads(_output);
@@ -211,7 +208,6 @@ public void proc1()
 
         //[Variation("Multiple GetExtensionObject for different namespace System.Xml.Tests")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc2()
         {
             CThreads rThreads = new CThreads(_output);
@@ -280,7 +276,6 @@ public int SharedArgList(object args)
         ////////////////////////////////////////////////////////////////
         //[Variation("Multiple transforms using shared ArgumentList")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc1()
         {
             CThreads rThreads = new CThreads(_output);
diff --git a/src/libraries/System.Private.Xml/tests/Xslt/XslTransformApi/CXslTransformMultith.cs b/src/libraries/System.Private.Xml/tests/Xslt/XslTransformApi/CXslTransformMultith.cs
index f81bf6240c84d0..7caf4550a068e8 100644
--- a/src/libraries/System.Private.Xml/tests/Xslt/XslTransformApi/CXslTransformMultith.cs
+++ b/src/libraries/System.Private.Xml/tests/Xslt/XslTransformApi/CXslTransformMultith.cs
@@ -76,7 +76,6 @@ public virtual int Transform(object args)
         [InlineData("xslt_mutith_variable_global_forward_ref_deep.xsl", "xslt_mutith_variable_nodeset.xml")]
         //[Variation("Local and global variables", Params = new object[] { "xslt_mutith_variable_local_and_global.xsl", "xslt_mutith_variable_local_and_global.xsl" })]
         [InlineData("xslt_mutith_variable_local_and_global.xsl", "xslt_mutith_variable_local_and_global.xsl")]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         public void Variations(object param0, object param1)
         {
diff --git a/src/libraries/System.Private.Xml/tests/Xslt/XslTransformApi/CXsltArgumentListMultith.cs b/src/libraries/System.Private.Xml/tests/Xslt/XslTransformApi/CXsltArgumentListMultith.cs
index d6b6e6e0a26614..ae2927e4308696 100644
--- a/src/libraries/System.Private.Xml/tests/Xslt/XslTransformApi/CXsltArgumentListMultith.cs
+++ b/src/libraries/System.Private.Xml/tests/Xslt/XslTransformApi/CXsltArgumentListMultith.cs
@@ -105,7 +105,6 @@ public int GetParam2(object args)
 
         //[Variation("Multiple GetParam for same parameter name")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc1()
         {
             CThreads rThreads = new CThreads(_output);
@@ -124,7 +123,6 @@ public void proc1()
 
         //[Variation("Multiple GetParam for different parameter name")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc2()
         {
             CThreads rThreads = new CThreads(_output);
@@ -191,7 +189,6 @@ public int GetExtnObject2(object args)
 
         //[Variation("Multiple GetExtensionObject for same namespace System.Xml.Tests")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc1()
         {
             CThreads rThreads = new CThreads(_output);
@@ -210,7 +207,6 @@ public void proc1()
 
         //[Variation("Multiple GetExtensionObject for different namespace System.Xml.Tests")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc2()
         {
             CThreads rThreads = new CThreads(_output);
@@ -279,7 +275,6 @@ public int SharedArgList(object args)
         ////////////////////////////////////////////////////////////////
         //[Variation("Multiple transforms using shared ArgumentList")]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void proc1()
         {
             CThreads rThreads = new CThreads(_output);
diff --git a/src/libraries/System.Runtime.Extensions/tests/System/EnvironmentTests.cs b/src/libraries/System.Runtime.Extensions/tests/System/EnvironmentTests.cs
index b797d36ea92b11..4f30dfd0a09b0d 100644
--- a/src/libraries/System.Runtime.Extensions/tests/System/EnvironmentTests.cs
+++ b/src/libraries/System.Runtime.Extensions/tests/System/EnvironmentTests.cs
@@ -59,7 +59,6 @@ public void CurrentManagedThreadId_Idempotent()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void CurrentManagedThreadId_DifferentForActiveThreads()
         {
             var ids = new HashSet<int>();
diff --git a/src/libraries/System.Runtime.Extensions/tests/System/Progress.cs b/src/libraries/System.Runtime.Extensions/tests/System/Progress.cs
index 531b1b2729e349..8fd7a61603ecea 100644
--- a/src/libraries/System.Runtime.Extensions/tests/System/Progress.cs
+++ b/src/libraries/System.Runtime.Extensions/tests/System/Progress.cs
@@ -18,7 +18,6 @@ public void Ctor()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void NoWorkQueuedIfNoHandlers()
         {
             RunWithoutSyncCtx(() =>
diff --git a/src/libraries/System.Runtime.InteropServices.JavaScript/tests/System.Runtime.InteropServices.JavaScript.Legacy.UnitTests/System/Runtime/InteropServices/JavaScript/MarshalTests.cs b/src/libraries/System.Runtime.InteropServices.JavaScript/tests/System.Runtime.InteropServices.JavaScript.Legacy.UnitTests/System/Runtime/InteropServices/JavaScript/MarshalTests.cs
index 625ddcad9030eb..9cee9aa13bef3b 100644
--- a/src/libraries/System.Runtime.InteropServices.JavaScript/tests/System.Runtime.InteropServices.JavaScript.Legacy.UnitTests/System/Runtime/InteropServices/JavaScript/MarshalTests.cs
+++ b/src/libraries/System.Runtime.InteropServices.JavaScript/tests/System.Runtime.InteropServices.JavaScript.Legacy.UnitTests/System/Runtime/InteropServices/JavaScript/MarshalTests.cs
@@ -743,6 +743,7 @@ private static async Task MarshalTaskReturningInt(string helperMethodName)
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/94253", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static async Task MarshalSynchronousTask()
         {
             bool success = await MarshalTask("SynchronousTask");
@@ -750,6 +751,7 @@ public static async Task MarshalSynchronousTask()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/94253", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static async Task MarshalAsynchronousTask()
         {
             bool success = await MarshalTask("AsynchronousTask");
@@ -757,18 +759,21 @@ public static async Task MarshalAsynchronousTask()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/94253", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static Task MarshalSynchronousTaskInt()
         {
             return MarshalTaskReturningInt("SynchronousTaskInt");
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/94253", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static Task MarshalAsynchronousTaskInt()
         {
             return MarshalTaskReturningInt("AsynchronousTaskInt");
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/94253", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static async Task MarshalFailedSynchronousTask()
         {
             bool success = await MarshalTask("FailedSynchronousTask");
@@ -776,6 +781,7 @@ public static async Task MarshalFailedSynchronousTask()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/94253", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static async Task MarshalFailedAsynchronousTask()
         {
             bool success = await MarshalTask("FailedAsynchronousTask");
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
index a7ba064e1fa007..59e6be759b4a09 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
@@ -16,7 +16,6 @@
 public static class XmlDictionaryWriterTest
 {
     [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
     public static void XmlBaseWriter_WriteBase64Async()
     {
         string actual;
@@ -64,7 +63,6 @@ public static void XmlBaseWriter_WriteBinHex()
     }
 
     [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
     public static void XmlBaseWriter_FlushAsync()
     {
         string actual = null;
@@ -145,7 +143,6 @@ public static void XmlBaseWriter_WriteStartEndElementAsync()
     }
 
     [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
     public static void XmlBaseWriter_CheckAsync_ThrowInvalidOperationException()
     {
         int byteSize = 1024;
diff --git a/src/libraries/System.Runtime/tests/System/Attributes.cs b/src/libraries/System.Runtime/tests/System/Attributes.cs
index bbf2705098083f..0b75b48ea133e7 100644
--- a/src/libraries/System.Runtime/tests/System/Attributes.cs
+++ b/src/libraries/System.Runtime/tests/System/Attributes.cs
@@ -327,7 +327,6 @@ public static class GetCustomAttribute
     {
 
         [Fact]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91597", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void customAttributeCount()
         {
             List<CustomAttributeData> customAttributes = typeof(GetCustomAttribute).Module.CustomAttributes.ToList();
diff --git a/src/libraries/System.Threading/tests/AutoResetEventTests.cs b/src/libraries/System.Threading/tests/AutoResetEventTests.cs
index 7a9ea944d79023..e79a5719664acc 100644
--- a/src/libraries/System.Threading/tests/AutoResetEventTests.cs
+++ b/src/libraries/System.Threading/tests/AutoResetEventTests.cs
@@ -205,7 +205,6 @@ public void WaitHandleWaitAny()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void PingPong()
         {
             using (AutoResetEvent are1 = new AutoResetEvent(true), are2 = new AutoResetEvent(false))
diff --git a/src/libraries/System.Threading/tests/BarrierTests.cs b/src/libraries/System.Threading/tests/BarrierTests.cs
index 438c1115c997ae..c6b8640cb58d29 100644
--- a/src/libraries/System.Threading/tests/BarrierTests.cs
+++ b/src/libraries/System.Threading/tests/BarrierTests.cs
@@ -292,7 +292,6 @@ public static void RunBarrierTest7a()
         /// </summary>
         /// <returns>True if the test succeeded, false otherwise</returns>
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void RunBarrierTest8_PostPhaseException()
         {
             bool shouldThrow = true;
diff --git a/src/libraries/System.Threading/tests/ExecutionContextTests.cs b/src/libraries/System.Threading/tests/ExecutionContextTests.cs
index b5f097ed88dead..178a6dc1794170 100644
--- a/src/libraries/System.Threading/tests/ExecutionContextTests.cs
+++ b/src/libraries/System.Threading/tests/ExecutionContextTests.cs
@@ -11,7 +11,6 @@ namespace System.Threading.Tests
     public static class ExecutionContextTests
     {
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void CreateCopyTest()
         {
             ThreadTestHelpers.RunTestInBackgroundThread(() =>
@@ -63,7 +62,6 @@ public static void DisposeTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void FlowTest()
         {
             ThreadTestHelpers.RunTestInBackgroundThread(() =>
@@ -181,7 +179,6 @@ public static void FlowTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void CaptureThenSuppressThenRunFlowTest()
         {
             ThreadTestHelpers.RunTestInBackgroundThread(() =>
@@ -268,7 +265,6 @@ private static void VerifyExecutionContextFlow(AsyncLocal<int> asyncLocal, int e
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void AsyncFlowControlTest()
         {
             ThreadTestHelpers.RunTestInBackgroundThread(() =>
diff --git a/src/libraries/System.Threading/tests/HostExecutionContextManagerTests.cs b/src/libraries/System.Threading/tests/HostExecutionContextManagerTests.cs
index 64473b11bbb668..def163c73e6089 100644
--- a/src/libraries/System.Threading/tests/HostExecutionContextManagerTests.cs
+++ b/src/libraries/System.Threading/tests/HostExecutionContextManagerTests.cs
@@ -8,7 +8,6 @@ namespace System.Threading.Tests
     public static class HostExecutionContextManagerTests
     {
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void BasicTest()
         {
             ThreadTestHelpers.RunTestInBackgroundThread(() =>
diff --git a/src/libraries/System.Threading/tests/InterlockedTests.cs b/src/libraries/System.Threading/tests/InterlockedTests.cs
index 6e2d4c99cacc8d..933404fdbfd76f 100644
--- a/src/libraries/System.Threading/tests/InterlockedTests.cs
+++ b/src/libraries/System.Threading/tests/InterlockedTests.cs
@@ -461,7 +461,6 @@ public void InterlockedOr_UInt64()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void InterlockedIncrement_Multithreaded_Int32()
         {
             const int ThreadCount = 10;
@@ -499,7 +498,6 @@ public void InterlockedIncrement_Multithreaded_Int32()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void InterlockedCompareExchange_Multithreaded_Double()
         {
             const int ThreadCount = 10;
@@ -548,7 +546,6 @@ public void InterlockedCompareExchange_Multithreaded_Double()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void InterlockedAddAndRead_Multithreaded_Int64()
         {
             const int ThreadCount = 10;
@@ -624,7 +621,6 @@ public void MemoryBarrierIntrinsic()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void MemoryBarrierProcessWide()
         {
             // Stress MemoryBarrierProcessWide correctness using a simple AsymmetricLock
diff --git a/src/libraries/System.Threading/tests/ManualResetEventTests.cs b/src/libraries/System.Threading/tests/ManualResetEventTests.cs
index 67667605c9e089..d75930ae5d3b35 100644
--- a/src/libraries/System.Threading/tests/ManualResetEventTests.cs
+++ b/src/libraries/System.Threading/tests/ManualResetEventTests.cs
@@ -148,7 +148,6 @@ public void WaitHandleWaitAny()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void PingPong()
         {
             using (ManualResetEvent mre1 = new ManualResetEvent(true), mre2 = new ManualResetEvent(false))
diff --git a/src/libraries/System.Threading/tests/MonitorTests.cs b/src/libraries/System.Threading/tests/MonitorTests.cs
index c37ed60e5af670..ca8ebe9544be1c 100644
--- a/src/libraries/System.Threading/tests/MonitorTests.cs
+++ b/src/libraries/System.Threading/tests/MonitorTests.cs
@@ -65,7 +65,6 @@ public static void IsEntered()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void IsEntered_WhenHeldBySomeoneElse()
         {
             var obj = new object();
@@ -217,7 +216,6 @@ public static void TryEnter_Invalid()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void Enter_HasToWait()
         {
             var thinLock = new object();
@@ -416,7 +414,6 @@ public static void Wait_Invalid()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void WaitTest()
         {
             var obj = new object();
@@ -453,7 +450,6 @@ public static void WaitTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void Enter_HasToWait_LockContentionCountTest()
         {
             long initialLockContentionCount = Monitor.LockContentionCount;
@@ -462,7 +458,6 @@ public static void Enter_HasToWait_LockContentionCountTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void ObjectHeaderSyncBlockTransitionTryEnterRaceTest()
         {
             var threadStarted = new AutoResetEvent(false);
diff --git a/src/libraries/System.Threading/tests/MutexTests.cs b/src/libraries/System.Threading/tests/MutexTests.cs
index cba95a622af7a4..ab2527db0f16df 100644
--- a/src/libraries/System.Threading/tests/MutexTests.cs
+++ b/src/libraries/System.Threading/tests/MutexTests.cs
@@ -202,7 +202,6 @@ public void MultiWaitWithAllIndexesLockedTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void MutualExclusionTest()
         {
             var threadLocked = new AutoResetEvent(false);
@@ -287,7 +286,6 @@ public void Ctor_TryCreateGlobalMutexTest_Uwp()
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [MemberData(nameof(GetValidNames))]
         public void OpenExisting(string name)
         {
@@ -664,7 +662,6 @@ private static void IncrementValueInFileNTimes(Mutex mutex, string fileName, int
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void NamedMutex_ThreadExitDisposeRaceTest()
         {
             var mutexName = Guid.NewGuid().ToString("N");
@@ -725,7 +722,6 @@ public void NamedMutex_ThreadExitDisposeRaceTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void NamedMutex_DisposeWhenLockedRaceTest()
         {
             var mutexName = Guid.NewGuid().ToString("N");
diff --git a/src/libraries/System.Threading/tests/ReaderWriterLockSlimTests.cs b/src/libraries/System.Threading/tests/ReaderWriterLockSlimTests.cs
index efd4abafc19c0d..d4569737e35078 100644
--- a/src/libraries/System.Threading/tests/ReaderWriterLockSlimTests.cs
+++ b/src/libraries/System.Threading/tests/ReaderWriterLockSlimTests.cs
@@ -177,7 +177,6 @@ public static void DeadlockAvoidance()
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [InlineData(LockRecursionPolicy.NoRecursion)]
         [InlineData(LockRecursionPolicy.SupportsRecursion)]
         public static void InvalidExits(LockRecursionPolicy policy)
@@ -322,7 +321,6 @@ public static void ReadersMayBeConcurrent()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void WriterToWriterChain()
         {
             using (AutoResetEvent are = new AutoResetEvent(false))
@@ -343,7 +341,6 @@ public static void WriterToWriterChain()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void WriterToReaderChain()
         {
             using (AutoResetEvent are = new AutoResetEvent(false))
@@ -364,7 +361,6 @@ public static void WriterToReaderChain()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void WriterToUpgradeableReaderChain()
         {
             using (AutoResetEvent are = new AutoResetEvent(false))
diff --git a/src/libraries/System.Threading/tests/ReaderWriterLockTests.cs b/src/libraries/System.Threading/tests/ReaderWriterLockTests.cs
index 2775fccde7042c..3ee587edc6318c 100644
--- a/src/libraries/System.Threading/tests/ReaderWriterLockTests.cs
+++ b/src/libraries/System.Threading/tests/ReaderWriterLockTests.cs
@@ -87,7 +87,6 @@ public static void ShouldNotBeOwnerForRestoreLockTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void InvalidLockCookieTest()
         {
             // Invalid lock cookie created by using one up with Upgrade/Downgrade
@@ -123,7 +122,6 @@ public static void InvalidLockCookieTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void BasicLockTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -501,7 +499,6 @@ public static void DowngradeQuirks_ChangedInDotNetCore()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void WaitingReadersTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -532,7 +529,6 @@ public static void WaitingReadersTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void WaitingWritersTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -564,7 +560,6 @@ public static void WaitingWritersTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void ReadersWaitingOnWaitingWriterTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -615,7 +610,6 @@ public static void ReadersWaitingOnWaitingWriterTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void ReadersWaitingOnWaitingUpgraderTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -669,7 +663,6 @@ public static void ReadersWaitingOnWaitingUpgraderTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void WaitingUpgradersTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -715,7 +708,6 @@ public static void WaitingUpgradersTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void AtomicRecursiveReaderTest()
         {
             var trwl = new TestReaderWriterLock();
@@ -742,7 +734,6 @@ public static void AtomicRecursiveReaderTest()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void AtomicDowngradeTest()
         {
             var trwl = new TestReaderWriterLock();
diff --git a/src/libraries/System.Threading/tests/SemaphoreTests.cs b/src/libraries/System.Threading/tests/SemaphoreTests.cs
index 3c1fd77c54e239..200728cfb9406f 100644
--- a/src/libraries/System.Threading/tests/SemaphoreTests.cs
+++ b/src/libraries/System.Threading/tests/SemaphoreTests.cs
@@ -278,7 +278,6 @@ public void CanWaitWithoutBlockingForReleasedCount()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/49890", TestPlatforms.Android)]
         public void AnonymousProducerConsumer()
         {
diff --git a/src/libraries/System.Threading/tests/SpinLockTests.cs b/src/libraries/System.Threading/tests/SpinLockTests.cs
index f07d4edcdf5480..5b027b32a58430 100644
--- a/src/libraries/System.Threading/tests/SpinLockTests.cs
+++ b/src/libraries/System.Threading/tests/SpinLockTests.cs
@@ -13,7 +13,6 @@ namespace System.Threading.Tests
     public class SpinLockTests
     {
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void EnterExit()
         {
             var sl = new SpinLock();
diff --git a/src/libraries/System.Threading/tests/ThreadLocalTests.cs b/src/libraries/System.Threading/tests/ThreadLocalTests.cs
index 323686f736554b..1327d768e1babf 100644
--- a/src/libraries/System.Threading/tests/ThreadLocalTests.cs
+++ b/src/libraries/System.Threading/tests/ThreadLocalTests.cs
@@ -60,7 +60,6 @@ public static void RunThreadLocalTest3_IsValueCreated()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void RunThreadLocalTest4_Value()
         {
             ThreadLocal<string> tlocal = null;
@@ -357,7 +356,6 @@ public static void RunThreadLocalTest8_Values_NegativeCases()
         }
 
         [Fact]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void RunThreadLocalTest9_Uninitialized()
         {
             for (int iter = 0; iter < 10; iter++)
@@ -440,7 +438,6 @@ public static void ValuesGetterDoesNotThrowUnexpectedExceptionWhenDisposed()
         private enum UniqueEnumUsedOnlyWithNonInterferenceTest { True, False }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void TestUnrelatedThreadLocalDoesNotInterfereWithTrackAllValues()
         {
             ThreadLocal<UniqueEnumUsedOnlyWithNonInterferenceTest> localThatDoesNotTrackValues = new ThreadLocal<UniqueEnumUsedOnlyWithNonInterferenceTest>(false);
diff --git a/src/libraries/System.Transactions.Local/tests/AsyncTransactionScopeTests.cs b/src/libraries/System.Transactions.Local/tests/AsyncTransactionScopeTests.cs
index ac8feb13d492cf..ff5c050292fcff 100644
--- a/src/libraries/System.Transactions.Local/tests/AsyncTransactionScopeTests.cs
+++ b/src/libraries/System.Transactions.Local/tests/AsyncTransactionScopeTests.cs
@@ -437,7 +437,6 @@ public void AsyncTSTest(int variation)
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         [InlineData(true, false, null)]
         [InlineData(true, true, null)]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void AsyncTSAndDependantClone(bool requiresNew, bool synchronizeScope, string txId)
         {
             string txId1 = null;
@@ -528,7 +527,6 @@ public void AsyncTSAndDependantClone(bool requiresNew, bool synchronizeScope, st
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         [InlineData(true, false, null)]
         [InlineData(true, true, null)]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91541", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void NestedAsyncTSAndDependantClone(bool parentrequiresNew, bool childRequiresNew, string txId)
         {
             string txId1;
@@ -1109,7 +1107,6 @@ public void VerifyBYOT(TransactionScopeAsyncFlowOption asyncFlowOption)
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/91538", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public void VerifyBYOTOpenConnSimulationTest()
         {
             // Create threads to do work
diff --git a/src/mono/wasm/debugger/tests/debugger-test/debugger-test.csproj b/src/mono/wasm/debugger/tests/debugger-test/debugger-test.csproj
index 4bd104e189426f..6a39c840002c84 100644
--- a/src/mono/wasm/debugger/tests/debugger-test/debugger-test.csproj
+++ b/src/mono/wasm/debugger/tests/debugger-test/debugger-test.csproj
@@ -8,7 +8,6 @@
     <WasmGenerateAppBundle>true</WasmGenerateAppBundle>
     <OutputType>library</OutputType>
     <WasmEmitSymbolMap>true</WasmEmitSymbolMap>
-    <_WasmPThreadPoolSize Condition="'$(MonoWasmBuildVariant)' == 'multithread'">10</_WasmPThreadPoolSize>
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
   </PropertyGroup>
   <ItemGroup>
diff --git a/src/mono/wasm/runtime/loader/config.ts b/src/mono/wasm/runtime/loader/config.ts
index 097f6d1ca2cb15..e805223074bccd 100644
--- a/src/mono/wasm/runtime/loader/config.ts
+++ b/src/mono/wasm/runtime/loader/config.ts
@@ -2,6 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 import BuildConfiguration from "consts:configuration";
+import MonoWasmThreads from "consts:monoWasmThreads";
+
 import type { DotnetModuleInternal, MonoConfigInternal } from "../types/internal";
 import type { DotnetModuleConfig, MonoConfig, ResourceGroups, ResourceList } from "../types";
 import { ENVIRONMENT_IS_WEB, exportedRuntimeAPI, loaderHelpers, runtimeHelpers } from "./globals";
@@ -186,6 +188,11 @@ export function normalizeConfig() {
         config.cachedResourcesPurgeDelay = 10000;
     }
 
+    if (MonoWasmThreads && !Number.isInteger(config.pthreadPoolSize)) {
+        // ActiveIssue https://github.com/dotnet/runtime/issues/91538
+        config.pthreadPoolSize = 40;
+    }
+
     // Default values (when WasmDebugLevel is not set)
     // - Build   (debug)    => debugBuild=true  & debugLevel=-1 => -1
     // - Build   (release)  => debugBuild=true  & debugLevel=0  => 0
diff --git a/src/mono/wasm/runtime/pthreads/browser/index.ts b/src/mono/wasm/runtime/pthreads/browser/index.ts
index a4e0428812d9f9..89c84baf78836e 100644
--- a/src/mono/wasm/runtime/pthreads/browser/index.ts
+++ b/src/mono/wasm/runtime/pthreads/browser/index.ts
@@ -5,9 +5,8 @@ import { isMonoWorkerMessageChannelCreated, monoSymbol, makeMonoThreadMessageApp
 import { pthreadPtr } from "../shared/types";
 import { MonoThreadMessage } from "../shared";
 import Internals from "../shared/emscripten-internals";
-import { createPromiseController, mono_assert, runtimeHelpers } from "../../globals";
+import { createPromiseController, runtimeHelpers } from "../../globals";
 import { PromiseController } from "../../types/internal";
-import { MonoConfig } from "../../types";
 import { mono_log_debug } from "../../logging";
 
 const threads: Map<pthreadPtr, Thread> = new Map();
@@ -114,19 +113,8 @@ export function afterLoadWasmModuleToWorker(worker: Worker): void {
 /// We call on the main thread this during startup to pre-allocate a pool of pthread workers.
 /// At this point asset resolution needs to be working (ie we loaded MonoConfig).
 /// This is used instead of the Emscripten PThread.initMainThread because we call it later.
-export function preAllocatePThreadWorkerPool(defaultPthreadPoolSize: number, config: MonoConfig): void {
-    const poolSizeSpec = config?.pthreadPoolSize;
-    let n: number;
-    if (poolSizeSpec === undefined || poolSizeSpec === null) {
-        n = defaultPthreadPoolSize;
-    } else {
-        mono_assert(typeof poolSizeSpec === "number", "pthreadPoolSize must be a number");
-        if (poolSizeSpec < 0)
-            n = defaultPthreadPoolSize;
-        else
-            n = poolSizeSpec;
-    }
-    for (let i = 0; i < n; i++) {
+export function preAllocatePThreadWorkerPool(pthreadPoolSize: number): void {
+    for (let i = 0; i < pthreadPoolSize; i++) {
         Internals.allocateUnusedWorker();
     }
 }
diff --git a/src/mono/wasm/runtime/startup.ts b/src/mono/wasm/runtime/startup.ts
index 84031fcf2dfcb9..7fec1577dedc94 100644
--- a/src/mono/wasm/runtime/startup.ts
+++ b/src/mono/wasm/runtime/startup.ts
@@ -38,9 +38,6 @@ import { BINDING, MONO } from "./net6-legacy/globals";
 import { localHeapViewU8 } from "./memory";
 import { assertNoProxies } from "./gc-handles";
 
-// default size if MonoConfig.pthreadPoolSize is undefined
-const MONO_PTHREAD_POOL_SIZE = 4;
-
 export async function configureRuntimeStartup(): Promise<void> {
     await init_polyfills_async();
     await checkMemorySnapshotSize();
@@ -181,6 +178,7 @@ async function preInitWorkerAsync() {
         mono_log_debug("preInitWorker");
         runtimeHelpers.beforePreInit.promise_control.resolve();
         mono_wasm_pre_init_essential(true);
+        await ensureUsedWasmFeatures();
         await init_polyfills_async();
         runtimeHelpers.afterPreInit.promise_control.resolve();
         endMeasure(mark, MeasuredBlock.preInitWorker);
@@ -393,7 +391,7 @@ async function mono_wasm_pre_init_essential_async(): Promise<void> {
     Module.addRunDependency("mono_wasm_pre_init_essential_async");
 
     if (MonoWasmThreads) {
-        preAllocatePThreadWorkerPool(MONO_PTHREAD_POOL_SIZE, runtimeHelpers.config);
+        preAllocatePThreadWorkerPool(runtimeHelpers.config.pthreadPoolSize!);
     }
 
     Module.removeRunDependency("mono_wasm_pre_init_essential_async");