diff --git a/packages/react-noop-renderer/src/createReactNoop.js b/packages/react-noop-renderer/src/createReactNoop.js
index d055149a09868..24970fbcc18d0 100644
--- a/packages/react-noop-renderer/src/createReactNoop.js
+++ b/packages/react-noop-renderer/src/createReactNoop.js
@@ -806,6 +806,7 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
           false,
           '',
           onRecoverableError,
+          null,
         );
         roots.set(rootID, root);
       }
@@ -859,6 +860,7 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
         false,
         '',
         onRecoverableError,
+        null,
       );
       return {
         _Scheduler: Scheduler,
diff --git a/packages/react-reconciler/src/ReactFiber.new.js b/packages/react-reconciler/src/ReactFiber.new.js
index e78db21baf74e..e81801ad5c8f3 100644
--- a/packages/react-reconciler/src/ReactFiber.new.js
+++ b/packages/react-reconciler/src/ReactFiber.new.js
@@ -734,6 +734,9 @@ export function createFiberFromLegacyHidden(
   const fiber = createFiber(LegacyHiddenComponent, pendingProps, key, mode);
   fiber.elementType = REACT_LEGACY_HIDDEN_TYPE;
   fiber.lanes = lanes;
+  // Adding a stateNode for legacy hidden because it's currently using
+  // the offscreen implementation, which depends on a state node
+  fiber.stateNode = {};
   return fiber;
 }
 
diff --git a/packages/react-reconciler/src/ReactFiber.old.js b/packages/react-reconciler/src/ReactFiber.old.js
index 15019976d0ab2..75fcba88bbd15 100644
--- a/packages/react-reconciler/src/ReactFiber.old.js
+++ b/packages/react-reconciler/src/ReactFiber.old.js
@@ -734,6 +734,9 @@ export function createFiberFromLegacyHidden(
   const fiber = createFiber(LegacyHiddenComponent, pendingProps, key, mode);
   fiber.elementType = REACT_LEGACY_HIDDEN_TYPE;
   fiber.lanes = lanes;
+  // Adding a stateNode for legacy hidden because it's currently using
+  // the offscreen implementation, which depends on a state node
+  fiber.stateNode = {};
   return fiber;
 }
 
diff --git a/packages/react/index.classic.fb.js b/packages/react/index.classic.fb.js
index 76326a0fe59d0..0a2795a626516 100644
--- a/packages/react/index.classic.fb.js
+++ b/packages/react/index.classic.fb.js
@@ -34,6 +34,7 @@ export {
   startTransition,
   startTransition as unstable_startTransition, // TODO: Remove once call sights updated to startTransition
   unstable_Cache,
+  unstable_TracingMarker,
   unstable_DebugTracingMode,
   unstable_LegacyHidden,
   unstable_Offscreen,
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index 938d7589c4e21..50d078d3f0fd9 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -33,6 +33,7 @@ export const {
   enableSyncDefaultUpdates,
   enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay,
   enableClientRenderFallbackOnTextMismatch,
+  enableTransitionTracing,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.
@@ -106,8 +107,6 @@ export const enableUseMutableSource = true;
 
 export const enableCustomElementPropertySupport = __EXPERIMENTAL__;
 
-export const enableTransitionTracing = false;
-
 export const enableSymbolFallbackForWWW = true;
 // Flow magic to verify the exports of this file match the original version.
 // eslint-disable-next-line no-unused-vars