I’m getting build errors despite the SourceGenerator apparently working correctly. Example code:

namespace VisGit.ViewModels
{
    public partial class MainViewModel: BaseViewModel
    {     
        [ObservableProperty]
        string _exceptionMessageText = "Exception Text";

        public MainViewModel()
        {
            ExceptionMessageText = "Test Change";
        }
    }
}

Intellisense shows the public property ExceptionMessageText as being generated successfully:

Also, source generator appears to work:

However, build error:

Full code: https://github.com/stigzler/VisGit/blob/1-setup-base-extension-environment/VisGit/ViewModels/MainViewModel.cs

Not sure what I’m dong wrong. Any ideas?