Reproduction Steps

1. Clone and re-open in devcontainer
2. Open FSharp file from F# Solution explorer
   1. errors are found, as dependencies have not been downloaded yet
3. Restore dependencies:
   1. cd accessviolationexception-repro/src
   2. dotnet restore
   3. errors are still shown
4. Reload window (cmd palette: Developer: Reload Window)
5. Open an FSharp file from F# Solution explorer
   1. no errors or tooltips
6. Review F# Output log
   1. see System.AccessViolationException

Workarounds

Still not functional, but avoid access violation errors

Not really a workaround, but it does affect the behavior:

1. Remove the fsproj from the solution:
   1. cd accessviolationexception-repro/src && dotnet sln remove AccessviolationexceptionRepro
   2. Reload window
   3. There are still no errors, tooltip hovers or hints, but there are also no AccessViolationException logs

Prevent errors

Not really a workaround, but this highlight that the issue is in one of the dependencies:

1. Delete the bin and obj folders in accessviolationexception-repro/src/AccessviolationexceptionRepro
2. Reload window
3. It reverts to the previous state - types from dependencies are marked as unknown but otherwise the F# language features are correct