Extension debug fails --attach on aspnet3.0 - net5.0 with services.AddAuthentication() declared

[ghost]

Extension locks up / does not show anything in Debug pane after this breakpoint:

public ConfigureServices() {
    services.AddAuthentication();    // wont launch dotnet web server or output to debug pane if service is present
}

Environment data

dotnet --info output: net5.0
VS Code version: latest
C# Extension version: 1.23.9

Using vscodium with latest extension installed.

OmniSharp log

Nothing logged to Output => Omnisharp Extension