As @darkpaw already mentioned: It was indeed a storyboard problem. Flutter: We moved the storyboards in a different folder to set the App-Language in the App-Store (App is only available in German). This was done a couple of months ago - during iOS 15 / Flutter 2.10.5. It all worked fine - even on other OS languages. Now, using the same code, the app crashes when using a different OS language than, in our case, German. A detailed description can be found here: https://stackoverflow.com/a/75145629/2104195

@Claude31: I have created an issue https://github.com/flutter/flutter/issues/118303

I am running into a similar issue with my app: https://stackoverflow.com/questions/75016349/flutter-ios-app-crash-on-launch-only-during-apple-app-store-review-ios-16-2 It just happens during App-Store review, not during local testing or when using TestFlight. Have you figured out what the problem was? Thanks