Test failure: ManagedTests.DynamicCSharp.Conformance.dynamic.dynamicType.conversions.numeric002.numeric002.Program.DynamicCSharpRunTest

[BruceForstall]

Fails in many configurations.

https://dev.azure.com/dnceng/public/_build/results?buildId=1092269&view=ms.vss-test-web.build-test-results-tab&runId=33463320&resultId=180640&paneView=dotnet-dnceng.dnceng-build-release-tasks.helix-test-information-tab

----- start Fri 04/16/2021  8:31:07.07 ===============  To repro directly: ===================================================== 
pushd C:\h\w\B49409DF\w\BC6D0999\e\
"C:\h\w\B49409DF\p\dotnet.exe" exec --runtimeconfig System.Dynamic.Runtime.Tests.runtimeconfig.json --depsfile System.Dynamic.Runtime.Tests.deps.json xunit.console.dll System.Dynamic.Runtime.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing 
popd
===========================================================================================================

C:\h\w\B49409DF\w\BC6D0999\e>"C:\h\w\B49409DF\p\dotnet.exe" exec --runtimeconfig System.Dynamic.Runtime.Tests.runtimeconfig.json --depsfile System.Dynamic.Runtime.Tests.deps.json xunit.console.dll System.Dynamic.Runtime.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing  
  Discovering: System.Dynamic.Runtime.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Dynamic.Runtime.Tests (found 2901 test cases)
  Starting:    System.Dynamic.Runtime.Tests (parallel test collections = on, max threads = 2)
    ManagedTests.DynamicCSharp.Conformance.dynamic.dynamicType.conversions.numeric002.numeric002.Program.DynamicCSharpRunTest [FAIL]
      Assert.Equal() Failure
      Expected: 0
      Actual:   1
      Stack Trace:
        /_/src/libraries/System.Dynamic.Runtime/tests/Dynamic.DynamicType/Conformance.dynamic.dynamicType.conversions.cs(5161,0): at ManagedTests.DynamicCSharp.Conformance.dynamic.dynamicType.conversions.numeric002.numeric002.Program.DynamicCSharpRunTest()
  Finished:    System.Dynamic.Runtime.Tests
=== TEST EXECUTION SUMMARY ===
   System.Dynamic.Runtime.Tests  Total: 2901, Errors: 0, Failed: 1, Skipped: 0, Time: 423.388s

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Issue Details

---

Fails in many configurations.

https://dev.azure.com/dnceng/public/_build/results?buildId=1092269&view=ms.vss-test-web.build-test-results-tab&runId=33463320&resultId=180640&paneView=dotnet-dnceng.dnceng-build-release-tasks.helix-test-information-tab

----- start Fri 04/16/2021  8:31:07.07 ===============  To repro directly: ===================================================== 
pushd C:\h\w\B49409DF\w\BC6D0999\e\
"C:\h\w\B49409DF\p\dotnet.exe" exec --runtimeconfig System.Dynamic.Runtime.Tests.runtimeconfig.json --depsfile System.Dynamic.Runtime.Tests.deps.json xunit.console.dll System.Dynamic.Runtime.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing 
popd
===========================================================================================================

C:\h\w\B49409DF\w\BC6D0999\e>"C:\h\w\B49409DF\p\dotnet.exe" exec --runtimeconfig System.Dynamic.Runtime.Tests.runtimeconfig.json --depsfile System.Dynamic.Runtime.Tests.deps.json xunit.console.dll System.Dynamic.Runtime.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing  
  Discovering: System.Dynamic.Runtime.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Dynamic.Runtime.Tests (found 2901 test cases)
  Starting:    System.Dynamic.Runtime.Tests (parallel test collections = on, max threads = 2)
    ManagedTests.DynamicCSharp.Conformance.dynamic.dynamicType.conversions.numeric002.numeric002.Program.DynamicCSharpRunTest [FAIL]
      Assert.Equal() Failure
      Expected: 0
      Actual:   1
      Stack Trace:
        /_/src/libraries/System.Dynamic.Runtime/tests/Dynamic.DynamicType/Conformance.dynamic.dynamicType.conversions.cs(5161,0): at ManagedTests.DynamicCSharp.Conformance.dynamic.dynamicType.conversions.numeric002.numeric002.Program.DynamicCSharpRunTest()
  Finished:    System.Dynamic.Runtime.Tests
=== TEST EXECUTION SUMMARY ===
   System.Dynamic.Runtime.Tests  Total: 2901, Errors: 0, Failed: 1, Skipped: 0, Time: 423.388s

Author:	BruceForstall
Assignees:	-
Labels:	area-System.Dynamic.Runtime, untriaged
Milestone:	-

[BruceForstall]

This also appears to be due to #50450 (reverting that change fixes the failure).

@SingleAccretion @briansull @tannergooding

[BruceForstall]

Related: #51380