Problem with diagnosticProvider and semanticTokensProvider after upgrade

[alexp2001]

I have upgraded my project to use the latest version of "monaco-languageclient" and now my diagnosticProvider and semanticTokensProvider no longer work. They used to work before the upgrade.

After spending some time investigating, I can see that the following methods "textDocument/diagnostic" and "textDocument/semanticTokens/full" are not getting executed after the upgrade and I do not see any errors.

What could be the possible reason?
Has anything changed lately with regards how we define diagnosticProvider and semanticTokensProvider?
Could it be some version compatibility issues?
I use the following versions

"monaco-languageclient": "~9.4.0",    
"vscode-languageclient": "~9.0.1",
"vscode-languageserver": "~9.0.1",
"vscode-languageserver-protocol": "~3.17.5"

Please suggest how I can debug this issue further.

If you could provide a minimum example how to define and use diagnosticProvider and semanticTokensProvider, I would appreciate it.

[kaisalmen]

Hi @alexp2001 which version(s) did you use before? Could you integrate your code into one of our Langium examples and open a PR? I guess your code is not openly available or is it?