OK. It is a much more involved refactoring then. Any suggested workaround?

I am wondering if in the future beta version, setting Metal language version would allow us to bypass this (currently it doesn't).

Yes. Saw the same issue with my app. Using appstoreconnect API to dig deeper, I saw https://contentdelivery.itunes.apple.com/MZContentDeliveryService/iris/v1/builds/[id] changes processingState between PROCESSING and FAILED. Would love someone from Apple to clarify whether there are some issues with macOS TestFlight backend right now or something else we've been doing wrong. Also my app is built with the latest Xcode 14.3, MacCatalyst. It only happens for macOS, not iOS.