diff --git a/src/mono/wasm/Wasm.Build.Tests/Blazor/SimpleMultiThreadedTests.cs b/src/mono/wasm/Wasm.Build.Tests/Blazor/SimpleMultiThreadedTests.cs
index c92fc5f35bf98..556d40d42a40e 100644
--- a/src/mono/wasm/Wasm.Build.Tests/Blazor/SimpleMultiThreadedTests.cs
+++ b/src/mono/wasm/Wasm.Build.Tests/Blazor/SimpleMultiThreadedTests.cs
@@ -38,6 +38,7 @@ public SimpleMultiThreadedTests(ITestOutputHelper output, SharedBuildPerTestClas
     // }
 
     [ConditionalTheory(typeof(BuildTestBase), nameof(IsWorkloadWithMultiThreadingForDefaultFramework))]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/100373")] // to be fixed by: "https://github.com/dotnet/aspnetcore/issues/54365"
     // [InlineData("Debug", false)] // ActiveIssue https://github.com/dotnet/runtime/issues/98758
     // [InlineData("Debug", true)]
     [InlineData("Release", false)]
diff --git a/src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/SignalRClientTests.cs b/src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/SignalRClientTests.cs
index 0c705079d4874..1b09272b48793 100644
--- a/src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/SignalRClientTests.cs
+++ b/src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/SignalRClientTests.cs
@@ -24,6 +24,7 @@ public SignalRClientTests(ITestOutputHelper output, SharedBuildPerTestClassFixtu
     }
 
     [ConditionalTheory(typeof(BuildTestBase), nameof(IsWorkloadWithMultiThreadingForDefaultFramework))]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/100445")] // to be fixed by: "https://github.com/dotnet/aspnetcore/issues/54365"
     [InlineData("Debug", "LongPolling")]
     [InlineData("Release", "LongPolling")]
     [InlineData("Debug", "WebSockets")]