intermittent failure for NonThrownException.Current

[SimonCropp]

Sentry dotnet relies on Ben.Demystifier. It is consumed as a git submodule. We also run the Ben.Demystifier tests as part of our build. We intermittently get a failure for Ben.Demystifier.Test.NonThrownException.Current on Ubuntu

https://github.com/getsentry/sentry-dotnet/runs/4501965612?check_suite_focus=true#step:7:247

Error: Ben.Demystifier.Test.NonThrownException.Current: Assert.Equal() Failure
  Failed Ben.Demystifier.Test.NonThrownException.Current [14 ms]
  Error Message:
   Assert.Equal() Failure
Expected: String[] ["   at bool System.Threading.ThreadPoolWorkQueue.Di"..., "   at void System.Threading.PortableThreadPool+Wor"..., "   at void System.Threading.Thread.StartCallback()"]
Actual:   WhereArrayIterator<String> ["   at bool System.Threading.ThreadPoolWorkQueue.Di"..., "   at void System.Threading.PortableThreadPool+Wor"...]
  Stack Trace:
     at Ben.Demystifier.Test.NonThrownException.Current() in /home/runner/work/sentry-dotnet/sentry-dotnet/modules/Ben.Demystifier/test/Ben.Demystifier.Test/NonThrownException.cs:line 110
--- End of stack trace from previous location ---
[xUnit.net 00:00:19.34]     Sentry.Tests.SentrySdkTests.Init_WithCache_BlocksUntilExistingCacheIsFlushed [SKIP]
  Skipped Sentry.Tests.SentrySdkTests.Init_WithCache_BlocksUntilExistingCacheIsFlushed [1 ms]

any ideas as to how to proceed? Since i am stumped.