diff --git a/eng/Versions.props b/eng/Versions.props
index 1eea1923b3117f..f9efc38c468ab3 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -47,9 +47,9 @@
     <MicrosoftCodeAnalysisNetAnalyzersVersion>7.0.0-preview1.22252.2</MicrosoftCodeAnalysisNetAnalyzersVersion>
     <MicrosoftCodeAnalysisVersion>4.3.0-1.22206.2</MicrosoftCodeAnalysisVersion>
     <!--
-      TODO: Remove pinned version once arcade supplies a 4.3 compiler.
+      TODO: Remove pinned version once arcade supplies a compiler that enables the repo to compile.
     -->
-    <MicrosoftNetCompilersToolsetVersion>4.3.0-2.22270.4</MicrosoftNetCompilersToolsetVersion>
+    <MicrosoftNetCompilersToolsetVersion>4.3.0-3.22281.14</MicrosoftNetCompilersToolsetVersion>
     <!-- SDK dependencies -->
     <MicrosoftDotNetCompatibilityVersion>2.0.0-preview.4.22252.4</MicrosoftDotNetCompatibilityVersion>
     <!-- Arcade dependencies -->
diff --git a/src/libraries/System.Net.Security/tests/UnitTests/NTAuthenticationTests.cs b/src/libraries/System.Net.Security/tests/UnitTests/NTAuthenticationTests.cs
index 5a9009db3f3c0f..6380764deb6d93 100644
--- a/src/libraries/System.Net.Security/tests/UnitTests/NTAuthenticationTests.cs
+++ b/src/libraries/System.Net.Security/tests/UnitTests/NTAuthenticationTests.cs
@@ -18,7 +18,7 @@ public class NTAuthenticationTests
 
         private static NetworkCredential s_testCredentialRight = new NetworkCredential("rightusername", "rightpassword");
         private static NetworkCredential s_testCredentialWrong = new NetworkCredential("rightusername", "wrongpassword");
-        private static byte[] s_Hello => "Hello"u8;
+        private static readonly byte[] s_Hello = "Hello"u8.ToArray();
 
         [Fact]
         public void NtlmProtocolExampleTest()
diff --git a/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.GenericMath.cs b/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.GenericMath.cs
index 00e3c9601aed76..63c445df80887f 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.GenericMath.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/NFloatTests.GenericMath.cs
@@ -1855,6 +1855,7 @@ public static void CreateCheckedFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateCheckedFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
@@ -2221,6 +2222,7 @@ public static void CreateSaturatingFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateSaturatingFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
@@ -2587,6 +2589,7 @@ public static void CreateTruncatingFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateTruncatingFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
diff --git a/src/libraries/System.Runtime.Numerics/tests/ComplexTests.GenericMath.cs b/src/libraries/System.Runtime.Numerics/tests/ComplexTests.GenericMath.cs
index 06ceb1fc7a54b2..9b6c1c74a63d0c 100644
--- a/src/libraries/System.Runtime.Numerics/tests/ComplexTests.GenericMath.cs
+++ b/src/libraries/System.Runtime.Numerics/tests/ComplexTests.GenericMath.cs
@@ -511,6 +511,7 @@ public static void CreateCheckedFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateCheckedFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
@@ -756,6 +757,7 @@ public static void CreateSaturatingFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateSaturatingFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
@@ -1001,6 +1003,7 @@ public static void CreateTruncatingFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateTruncatingFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
diff --git a/src/libraries/System.Runtime/tests/System/DoubleTests.GenericMath.cs b/src/libraries/System.Runtime/tests/System/DoubleTests.GenericMath.cs
index a1bae12e9275fd..e19a7e4f72adf7 100644
--- a/src/libraries/System.Runtime/tests/System/DoubleTests.GenericMath.cs
+++ b/src/libraries/System.Runtime/tests/System/DoubleTests.GenericMath.cs
@@ -1284,6 +1284,7 @@ public static void CreateCheckedFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateCheckedFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
@@ -1572,6 +1573,7 @@ public static void CreateSaturatingFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateSaturatingFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
@@ -1860,6 +1862,7 @@ public static void CreateTruncatingFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateTruncatingFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
diff --git a/src/libraries/System.Runtime/tests/System/SingleTests.GenericMath.cs b/src/libraries/System.Runtime/tests/System/SingleTests.GenericMath.cs
index 709bd3d04926e3..2d3d0204cd6065 100644
--- a/src/libraries/System.Runtime/tests/System/SingleTests.GenericMath.cs
+++ b/src/libraries/System.Runtime/tests/System/SingleTests.GenericMath.cs
@@ -1286,6 +1286,7 @@ public static void CreateCheckedFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateCheckedFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
@@ -1576,6 +1577,7 @@ public static void CreateSaturatingFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateSaturatingFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
@@ -1866,6 +1868,7 @@ public static void CreateTruncatingFromUInt128Test()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/69795", TestRuntimes.Mono)]
         public static void CreateTruncatingFromUIntPtrTest()
         {
             if (Environment.Is64BitProcess)
diff --git a/src/mono/wasm/debugger/BrowserDebugProxy/JObjectValueCreator.cs b/src/mono/wasm/debugger/BrowserDebugProxy/JObjectValueCreator.cs
index 5346b982238be9..523204d6ea858a 100644
--- a/src/mono/wasm/debugger/BrowserDebugProxy/JObjectValueCreator.cs
+++ b/src/mono/wasm/debugger/BrowserDebugProxy/JObjectValueCreator.cs
@@ -75,12 +75,15 @@ long or ulong
             _ => null
         };
 
-    public static JObject CreateNull(string className!!)
-        => Create<object>(value: null,
+    public static JObject CreateNull(string className)
+    {
+        ArgumentNullException.ThrowIfNull(className);
+        return Create<object>(value: null,
                           type: "object",
                           description: className,
                           className: className,
                           subtype: "null");
+    }
 
     public async Task<JObject> ReadAsVariableValue(
         MonoBinaryReader retDebuggerCmdReader,