I have this problem ONLY when debugging Photo Extensions and ONLY since upgrading to Ventura. Of course I tried all suggestions here: Developer Mode enabled ➔ Of Course as I can debug everything except Photo Extension Debug Executable is off, Command Line Tools are set correctly etc. as the only variable was the upgrade from Monterey to Ventura. I have tried everything I could find on the topic, so I am very grateful for any suggestions!! All the best Christoph

Actually looks like this was a pure debugger problem, in the TestFlight version everything works :)

Ups looks like exactly this exists as MainActor.run :)