Same issue here. Running an M1 Chip on the latest Big Sur on Xcode 12. Even when I open up a USDZ file, if Xcode is open, it will automatically crash. Cannot work with any of the reality kit objects due to this bug. Hope it is fixed soon as I just got this Mac specifically for MR Development. Gonna try a different version of Xcode and will report back .
Bigmrrob
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution