Try doing this instead in the parser

Author: jakebailey

src/compiler/checker.ts

@@ -28912,14 +28912,7 @@ namespace ts {
             return nonNullType;
         }
 
-        function checkGrammarPropertyAccessExpression(node: PropertyAccessExpression) {
-            if (node.expression.kind === SyntaxKind.ExpressionWithTypeArguments) {
-                grammarErrorOnNode(node.name, Diagnostics.Instantiation_expression_cannot_be_followed_by_property_access);
-            }
-        }
-
         function checkPropertyAccessExpression(node: PropertyAccessExpression, checkMode: CheckMode | undefined) {
-            checkGrammarPropertyAccessExpression(node);
             return node.flags & NodeFlags.OptionalChain ? checkPropertyAccessChain(node as PropertyAccessChain, checkMode) :
                 checkPropertyAccessExpressionOrQualifiedName(node, node.expression, checkNonNullExpression(node.expression), node.name, checkMode);
         }

src/compiler/parser.ts

@@ -5646,6 +5646,9 @@ namespace ts {
             if (isOptionalChain && isPrivateIdentifier(propertyAccess.name)) {
                 parseErrorAtRange(propertyAccess.name, Diagnostics.An_optional_chain_cannot_contain_private_identifiers);
             }
+            else if (isExpressionWithTypeArguments(expression)) {
+                parseErrorAtRange(propertyAccess.name, Diagnostics.Instantiation_expression_cannot_be_followed_by_property_access);
+            }
             return finishNode(propertyAccess, pos);
         }