We are not using CoreData and the above happens.

iOS 15.3.1 version iPhone or iPad still has that phenomenon. Couldn't find a solution.

No, it's not English, it's another language.

I also tried operatingSystemVersion . operatingSystemVersion is also returned as iOS 15.0.

It still happens in version 15.0.1 as well. It has not been modified. It happens with all apps sold on the App Store. The model I am using is iPhone 12 Pro Max and the iOS version is 15.0.1.

Oh you have similar symptoms!! I also have the same symptoms on iphone 12 promex ios 15 There was no such symptom on iphone 8s plus iOS 15.1 beta. It doesn't go away even after rebooting the device.

Not only our app, but also other company/individual apps have the same symptoms. If we repeat the above process, sometimes the symptoms keep coming back and sometimes they don't. Most of them happen after a few iterations.