C# language server stopped working after switching to .ts file with tsgo enabled

[bjoerni79]

Extension Version

0.20251228.1

VS Code Version

1.107.1

Operating system Version

Windows 11

Steps to reproduce

1. Set up a .NET ASP (MVC) project
2. Build a simple MVC project (or default from dotnet console)
3. Add typescript support
4. Enable tsgo
5. Switching between the C# and tsgo lsp causes inconsistency in c#. I.e. The go to declaration function does not longer work and the reference count is limited to the same class.

tsgo.log

Issue

I am developing a ASP.NET MVC web app and use TS for my Javascript code. Works great.
I noticed that after switching to tsgo (today, Dec, 28th, 2025), the C# LSP does not seem to work as expected.

I.e. the reference counter and the go to definition stopped working. I could compile and start the web app, this was not the issue.

If you need any logs, please let me know. I can go back if required, this is not the issue.

[DanielRosenwasser]

Can you elaborate a bit more on what isn't working? Are you using this from a Razor template or something?