code navigation not working if Downloading the .NET Runtime failed

## Environment data
`dotnet --info` output:
Downloading the .NET Runtime.
Downloading .NET version(s) 7.0.9 .............................................................. Error!
Failed to download .NET 7.0.9:
.NET installation timed out.

Error!
.NET Acquisition Failed: Installation failed: Error: .NET installation timed out.

VS Code version:1.78.2
C# Extension version: v2.0.320

## OmniSharp log

## Steps to reproduce

1. cut the net
2. start up vscode
3. wait for timeout
4. see error
5. code navigation(F12 or Ctrl + Click) not working

## Expected behavior
no matter what happned, code navigation should be able to work

## Actual behavior

## Additional context
Add any other context about the problem here.