Processing stops when "authorizationStatusForEntityType" is called

In the iOS app currently under development, when I called "[[MPMediaQuery alloc] init]" and then called "[EKEventStore authorizationStatusForEntityType: EKEntityTypeEvent]", the process stopped there.

This probrem only occurs in iOS 15.1 and not in iOS 15.0 or iOS 15.2.

Please tell me how to deal with this problem.