HomeKit HMLocationEvent region parameter becomes nil

MLocationEvent *aEvent = [[HMLocationEvent alloc] initWithRegion:region];

                [self.eventTrigger updateEvents:@[aEvent] completionHandler:^(NSError * _Nullable error) {

                    

                }];

When I call it, I get the trigger again, and the region has a value, but when I cut off the app and re-enter, the region parameter will become nil. Why?
Please file a bug report including a sysdiagnose with the HomeKit logging profile installed (https://download.developer.apple.com/iOS/iOS_Logs/Home_app__HomeKit_Logging_Instructions.pdf).
HomeKit HMLocationEvent region parameter becomes nil
 
 
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