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I encountered the same problem today.Environment:Xcode 11.4.1, Mac mini 2018, macOS Catalina 10.15.3,tested with two iPhone 6(both are iOS 12.4.6), they have this problem too(but not in every launch),also tested with an iPhone 8+, which doesn't have this problem at allI deleted folders inside ~/Library/Developer/Xcode/iOS DeviceSupport/ (folder's name started with 12.4.6), then run Xcode and launch an app again, problem solved.What a weird bug...