System.Diagnostics.Metrics.Tests.MetricEventSourceTests.EventSourceFiltersInstruments failing in CI (Outerloop) #79749

Unexpected Error event: System.MethodAccessException: Attempt by security transparent method 'System.Diagnostics.Metrics.MetricsEventSource+MetricSpec.Parse(System.String)' to access security critical method 'System.MemoryExtensions.AsSpan(System.String, Int32, Int32)' failed.

Assembly 'System.Diagnostics.DiagnosticSource, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' is marked with the AllowPartiallyTrustedCallersAttribute, and uses the level 2 security transparency model.  Level 2 transparency causes all methods in AllowPartiallyTrustedCallers assemblies to become security transparent by default, which may be the cause of this exception.
at System.Diagnostics.Metrics.MetricsEventSource.MetricSpec.Parse(String text) in //src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/MetricsEventSource.cs:line 474
at System.Diagnostics.Metrics.MetricsEventSource.CommandHandler.ParseSpecs(String metricsSpecs) in //src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/MetricsEventSource.cs:line 393
at System.Diagnostics.Metrics.MetricsEventSource.CommandHandler.OnEventCommand(EventCommandEventArgs command) in /_/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/MetricsEventSource.cs:line 363
Expected: True
Actual:   False
  at System.Diagnostics.Metrics.Tests.MetricsEventListener.AssertOnError() in /_/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricEventSourceTests.cs:line 1144
   at System.Diagnostics.Metrics.Tests.MetricsEventListener.GetCountEvents(String eventName) in /_/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricEventSourceTests.cs:line 1153
   at System.Diagnostics.Metrics.Tests.MetricsEventListener.WaitForEvent(TimeSpan timeout, Int32 numEvents, String eventName) in /_/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricEventSourceTests.cs:line 1117
   at System.Diagnostics.Metrics.Tests.MetricEventSourceTests.EventSourceFiltersInstruments() in /_/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricEventSourceTests.cs:line 272