diff --git a/src/libraries/System.Collections.Concurrent/tests/ConcurrentDictionary/ConcurrentDictionary.Generic.Tests.cs b/src/libraries/System.Collections.Concurrent/tests/ConcurrentDictionary/ConcurrentDictionary.Generic.Tests.cs
index fcb69130195742..408f86888be1e7 100644
--- a/src/libraries/System.Collections.Concurrent/tests/ConcurrentDictionary/ConcurrentDictionary.Generic.Tests.cs
+++ b/src/libraries/System.Collections.Concurrent/tests/ConcurrentDictionary/ConcurrentDictionary.Generic.Tests.cs
@@ -47,6 +47,7 @@ protected override string CreateTKey(int seed)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/124344", typeof(PlatformDetection), nameof(PlatformDetection.IsAppleMobile), nameof(PlatformDetection.IsCoreCLR))]
         public void NonRandomizedToRandomizedUpgrade_FunctionsCorrectly(bool ignoreCase)
         {
             List<string> strings = GenerateCollidingStrings(110); // higher than the collisions threshold
diff --git a/src/libraries/tests.proj b/src/libraries/tests.proj
index d6c4aed495b680..60c79348724db8 100644
--- a/src/libraries/tests.proj
+++ b/src/libraries/tests.proj
@@ -664,9 +664,7 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime.Serialization.Xml\tests\System.Runtime.Serialization.Xml.Tests.csproj" />
 
     <!-- Timeouts -->
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Collections.Concurrent\tests\System.Collections.Concurrent.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Net.HttpListener\tests\System.Net.HttpListener.Tests.csproj" />
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.Json\tests\System.Text.Json.Tests\System.Text.Json.Tests.csproj" />
 
     <!-- Not supported on Apple mobile -->
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.ComponentModel.Composition\tests\System.ComponentModel.Composition.Tests.csproj" />