Yes, I've been seeing this too. I filed FB13430457 with a description of my problem.
Michael Patrick Ellard
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Having the same problem. Reported it in FB13430457.
For those of you testing with the Xcode 15.1 beta, when you did your test did you first delete the app and its container? I'm wondering if once the container has the incorrect permissions set, that persists even when using a fixed version of Xcode. I'm hoping that if you deleted the app and its data altogether and then reinstalled it, that would work...