I have the same issue. The app is working fine with SwiftData and updates the widget when changes made. I am though not using App Groups but iCloud to share data.
When the app is open (in the background) and the Widget intent is updating the data, the widget is working fine but the app is not updating.
After completely closing the app and opening back up the data is updated.
When the app is fully closed and the Widget intent updating the data, opening the app is showing the correct data.
Bobbify
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