Editing `Projectable` attribute to set `NullNullConditionalRewriteSupport` causes codeLens to crash in Visual Studio and VSCode

[steve-price-immybot]

Using EntityFrameworkCore.Projectables v4.0,0.

When editing a projectable attribute to set NullConditionalRewriteSupport = NullConditionalRewriteSupport.Rewrite, the underlying codeLens crashes. In VS Code, only reloading the Window or the full IDE restores normal functioning, even after NullConditionalRewriteSupport is properly set. As long at the code is not changed after that, codeLens and the language server continue to operate as expected.

A similar crash also occurs in VS 2022.

The following error output is from the error notification in VSCode.

2025-09-11 11:02:20.378 [info] [Error - 11:02:20 AM] [codeLens/resolve] [LSP] System.ArgumentException: SyntaxTree is not part of the compilation (Parameter 'syntaxTree')
   at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetSemanticModel(SyntaxTree syntaxTree, SemanticModelOptions options) in /_/src/Compilers/CSharp/Portable/Compilation/CSharpCompilation.cs:line 2547
   at Microsoft.CodeAnalysis.Diagnostics.SuppressMessageAttributeState.IsDiagnosticSuppressed(Diagnostic diagnostic, SuppressMessageInfo& info)
   at Microsoft.CodeAnalysis.Diagnostics.SuppressMessageAttributeState.ApplySourceSuppressions(Diagnostic diagnostic) in /_/src/Compilers/Core/Portable/DiagnosticAnalyzer/SuppressMessageAttributeState.cs:line 120
   at Microsoft.CodeAnalysis.GeneratorDriver.RunGeneratorsCore(Compilation compilation, DiagnosticBag diagnosticsBag, Func`2 generatorFilter, CancellationToken cancellationToken) in /_/src/Compilers/Core/Portable/SourceGeneration/GeneratorDriver.cs:line 326
   at Microsoft.CodeAnalysis.SolutionCompilationState.RegularCompilationTracker.ComputeNewGeneratorInfoInCurrentProcessAsync(SolutionCompilationState compilationState, Compilation compilationWithoutGeneratedFiles, TextDocumentStates`1 oldGeneratedDocuments, GeneratorDriver generatorDriver, Compilation compilationWithStaleGeneratedTrees, CancellationToken cancellationToken) in /_/src/Workspaces/Core/Portable/Workspace/Solution/SolutionCompilationState.RegularCompilationTracker_Generators.cs:line 268
   at Microsoft.CodeAnalysis.SolutionCompilationState.RegularCompilationTracker.AddExistingOrComputeNewGeneratorInfoAsync(CreationPolicy creationPolicy, SolutionCompilationState compilationState, Compilation compilationWithoutGeneratedFiles, CompilationTrackerGeneratorInfo generatorInfo, Compilation compilationWithStaleGeneratedTrees, CancellationToken cancellationToken) in /_/src/Workspaces/Core/Portable/Workspace/Solution/SolutionCompilationState.RegularCompilationTracker_Generators.cs:line 66
   at Microsoft.CodeAnalysis.SolutionCompilationState.RegularCompilationTracker.<>c__DisplayClass25_0.<<GetOrBuildFinalStateAsync>g__FinalizeCompilationWorkerAsync|4>d.MoveNext() in /_/src/Workspaces/Core/Portable/Workspace/Solution/SolutionCompilationState.RegularCompilationTracker.cs:line 583
--- End of stack trace from previous location ---
   at Microsoft.CodeAnalysis.SolutionCompilationState.RegularCompilationTracker.<>c__DisplayClass25_0.<<GetOrBuildFinalStateAsync>g__FinalizeCompilationAsync|3>d.MoveNext() in /_/src/Workspaces/Core/Portable/Workspace/Solution/SolutionCompilationState.RegularCompilationTracker.cs:line 455
--- End of stack trace from previous location ---
   at Microsoft.CodeAnalysis.SolutionCompilationState.RegularCompilationTracker.<>c__DisplayClass25_0.<<GetOrBuildFinalStateAsync>g__BuildFinalStateAsync|0>d.MoveNext() in /_/src/Workspaces/Core/Portable/Workspace/Solution/SolutionCompilationState.RegularCompilationTracker.cs:line 305
--- End of stack trace from previous location ---
   at Microsoft.CodeAnalysis.SolutionCompilationState.RegularCompilationTracker.GetOrBuildFinalStateAsync(SolutionCompilationState compilationState, CancellationToken cancellationToken) in /_/src/Workspaces/Core/Portable/Workspace/Solution/SolutionCompilationState.RegularCompilationTracker.cs:line 267
   at Microsoft.CodeAnalysis.SolutionCompilationState.RegularCompilationTracker.GetCompilationSlowAsync(SolutionCompilationState compilationState, CancellationToken cancellationToken) in /_/src/Workspaces/Core/Portable/Workspace/Solution/SolutionCompilationState.RegularCompilationTracker.cs:line 238
   at Microsoft.CodeAnalysis.Shared.Extensions.ProjectExtensions.GetRequiredCompilationAsync(Project project, CancellationToken cancellationToken) in /_/src/Workspaces/SharedUtilitiesAndExtensions/Workspace/Core/Extensions/ProjectExtensions.cs:line 111
   at Microsoft.CodeAnalysis.Document.<>c__DisplayClass28_0.<<GetSemanticModelHelperAsync>g__GetSemanticModelWorkerAsync|0>d.MoveNext() in /_/src/Workspaces/Core/Portable/Workspace/Solution/Document.cs:line 351
--- End of stack trace from previous location ---
   at Microsoft.CodeAnalysis.Document.GetSemanticModelHelperAsync(Boolean disableNullableAnalysis, CancellationToken cancellationToken) in /_/src/Workspaces/Core/Portable/Workspace/Solution/Document.cs:line 331
   at Microsoft.CodeAnalysis.CodeLens.CodeLensReferencesService.FindAsync[T](Solution solution, DocumentId documentId, SyntaxNode syntaxNode, Func`2 onResults, Func`2 onCapped, Int32 searchCap, CancellationToken cancellationToken) in /_/src/Features/Core/Portable/CodeLens/CodeLensReferencesService.cs:line 52
   at Microsoft.CodeAnalysis.CodeLens.CodeLensReferencesService.GetReferenceCountAsync(Solution solution, DocumentId documentId, SyntaxNode syntaxNode, Int32 maxSearchResults, CancellationToken cancellationToken) in /_/src/Features/Core/Portable/CodeLens/CodeLensReferencesService.cs:line 92
   at Microsoft.CodeAnalysis.LanguageServer.Handler.CodeLens.CodeLensResolveHandler.HandleRequestAsync(CodeLens request, RequestContext context, CancellationToken cancellationToken) in /_/src/LanguageServer/Protocol/Handler/CodeLens/CodeLensResolveHandler.cs:line 67
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`1.StartRequestAsync[TRequest,TResponse](TRequest request, TRequestContext context, IMethodHandler handler, String language, CancellationToken cancellationToken)
2025-09-11 11:02:20.379 [info] [Error - 11:02:20 AM] Request codeLens/resolve failed.
2025-09-11 11:02:20.379 [info]   Message: SyntaxTree is not part of the compilation (Parameter 'syntaxTree')
  Code: -32000 
[object Object]