LanguageSettingsPersister.TryFetch assertion is being hit #43393
Description
Version Used:
16.6.0 Preview 2
Steps to Reproduce:
No repro. This is being hit in our fault telemetry and is new for 16.6.
["Roslyn.Utilities.Contract.Fail(String) Unexpected true
>>>Roslyn.Utilities.Contract.ThrowIfTrue(Boolean)
>>>Microsoft.VisualStudio.LanguageServices.Implementation.Options.LanguageSettingsPersister.TryFetch(OptionKey,Object&)
>>>Microsoft.CodeAnalysis.Options.GlobalOptionService.LoadOptionFromSerializerOrGetDefault(OptionKey)
>>>Microsoft.CodeAnalysis.Options.GlobalOptionService.GetOption_NoLock(OptionKey)
>>>Microsoft.CodeAnalysis.Options.GlobalOptionService.GetSerializableOptionValues(ImmutableHashSet`1,ImmutableHashSet`1)
>>>Microsoft.CodeAnalysis.Options.GlobalOptionService.GetSerializableOptionsSnapshot(ImmutableHashSet`1,IOptionService)
>>>Microsoft.CodeAnalysis.Options.OptionServiceFactory.OptionService.GetSerializableOptionsSnapshot(ImmutableHashSet`1)
>>>Microsoft.CodeAnalysis.Options.SerializableOptionSet.WithLanguages(ImmutableHashSet`1)
>>>Microsoft.CodeAnalysis.SolutionState.Branch(SolutionAttributes,IReadOnlyList`1,SerializableOptionSet,ImmutableDictionary`2,ImmutableDictionary`2,ImmutableDictionary`2,ProjectDependencyGraph)
>>>Microsoft.CodeAnalysis.SolutionState.AddProject(ProjectId,ProjectState)
>>>Microsoft.CodeAnalysis.SolutionState.AddProject(ProjectInfo)
>>>Microsoft.CodeAnalysis.Solution.AddProject(ProjectInfo)
>>>Microsoft.CodeAnalysis.Workspace.OnProjectAdded_NoLock(ProjectInfo,Boolean)
>>>Microsoft.CodeAnalysis.Workspace.OnProjectAdded(ProjectInfo,Boolean)
>>>Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioProjectFactory.<>c__DisplayClass5_0.<CreateAndAddToWorkspace>b__0(Workspace)
>>>Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioWorkspaceImpl.ApplyChangeToWorkspace(Action`1)
>>>Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioProjectFactory.CreateAndAddToWorkspace(String,String,VisualStudioProjectCreationInfo)
>>>Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.CPS.CPSProjectFactory.CreateVisualStudioProject(String,String,String,IVsHierarchy,Guid)
>>>Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.CPS.CPSProjectFactory.Microsoft.VisualStudio.LanguageServices.ProjectSystem.IWorkspaceProjectContextFactory.CreateProjectContext(String,String,String,Guid,Object,String)
>>>Microsoft.VisualStudio.ProjectSystem.LanguageServices.WorkspaceProjectContextProvider.<CreateProjectContextHandlingFaultAsync>d__8.MoveNext()
>>>System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
>>>Microsoft.VisualStudio.ProjectSystem.CommonProjectSystemTools.Rethrow(Exception)
>>>Microsoft.VisualStudio.ProjectSystem.ProjectErrorReporting.<>c__DisplayClass6_0.<SubmitErrorReport>b__0()
>>>Microsoft.VisualStudio.ProjectSystem.ExceptionFilter.<>c__DisplayClass2_0.<Guard>g__action|0()
>>>GuardMethodClass.GuardMethod(Func`1,Func`2,Func`2)"]