I've downloaded this extension: screen image
Working folder is selected, .csproj is selected. I did enable and disabled the extension, restarted VS Code, but still it didnt help. There are only keywords that i'm using in the list, but no any System.Object and other types functionality available: screen image 2
upd: Forgot to mention that my sdk and runtime installed via snap tool, so .net sdk path is /snap/dotnet-sdk/167/sdk/5.0.408/ Could snap be the problem, if yes, how to fix it?