Editor stuck in out of sync state, all services are broken

[Peter-Juhasz]

VS 17.13 P2.1

Potentially a new occurrence of #10759, at least the symptoms are the same, but don't know how to reproduce.

20250113-2050-11.5206610.mp4

This is the only log I got:

[LSP][LanguageServer.Semantic.LSPCSharpSemanticTokensProvider] [21:45:27.3641380] We are behind the C# version which is surprising. Could be an old request that wasn't cancelled, but if not, expect most future requests to fail. We were wanting 251 but C# is at 254.

Reopening the file resets and solves the issue.