I am seeing similar behavior using macOS 26.4 No clue how to fix this...

Thanks for your reply. With further debugging I was able to isolate the issue. It was no bug with the beta but rather with my model not staying in sync between the main app and the widget. After fixing this my code above worked reliable.

I am running in the same issue. I think you should definitely file a Feedback for this. I'll do the same.