It's not working on devices either for me. The schema updates as expected, but records don't appear to land in the database, despite reporting a successful change.
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Are you using real devices or simulators? There has (always?) been a problem with the simulators that required the app to be minimised and refocused before the iCloud data refresh would be triggered. However I've noticed with the Xcode 13 Beta the simulator now needs the application to close and be restarted before the data would be synchronised... I'm pretty sure this is a pre-release bug.
See comments below