I am facing the same issue, and my apple data and record type can not sync to cloudkit dashboard Did you solve the issue at last?

There are 15.6 device support file in some github. You may try to search and download a 15.6 device support file and paste it to Xcode > Contents > Developer > Platforms > iPhoneOS.platform > DeviceSupport

I found the solution..... DEPLOY TO A REAL IPHONE, don't do it on simulator..... everything works fine then.

AVSpeechSynthesisVoice works on iPadOS 16 physical device, work on iOS16 simulator, but not work on iOS16.0.3 (require to select in iPhone > Settings > Accessibility > Spoken Content > Voices ; it will override no matter what voice you choose)