This has been around at least since iOS 26.0. People inside Apple, see FB22249314 for details

In my testing this is affecting apps on iOS 15b4 and macOS 12b4 using CloudKit, but only TestFlight/Beta builds done with Xcode 13 (doesn't have to be b4, b3 builds seem to have the problem, too). App Store releases of my app seem not to exhibit the issue when running on iOS 15b4 or macOS 12b4 - is this what others are seeing as well?