The neweast Xcode Version 12.1 (12A7403) is same with "Here are what I saw with Xcode 12.1 GM iPhone11: 48 iPhone12/12 pro/12 pro max: 47 iPhone12 mini: 44 but navigation bar starts with 50, this seems to be bug for Apple. Other iPhones: 44." It is possible that this is Xcode's bug on iphone12mini simulator.