Using the BGTaskScheduler we are seeing a large amount of crashes from stack traces showing on BGTaskScheduler.shared.submit(). I have verified the following BG Task is registered only once Task is registered before returning from applicationDidFinishLaunching I have the correct capabilities added Background Fetch Check identifier for task matches string in .plist Task Submit request is performed on a background thread We are only seeing this issue on iOS 15 Has anyone else experience this issue? I cannot see a way that I am miss-using this API to cause a crash. // Method called on appDidFinishLaunching    func registerTimeZoneBGTask() {     BGTaskScheduler.shared.register(forTaskWithIdentifier: TimeZoneRefreshIdentifier,                     using: nil) { task in        // Handle Task     }   }   @objc class func submitTimeZoneUpdateBackgroundTask() {     do {       let backgroundAppRefreshRequest = BGAppRefreshTaskRequest(identifier: TimeZoneRefreshIdentifier)       backgroundAppRefreshRequest.earliestBeginDate = Date(timeIntervalSinceNow: 3600) // Crash occurs on the next call       try BGTaskScheduler.shared.submit(backgroundAppRefreshRequest)     } catch {       Logger.appLog("TimeZone Refresh - Failed to submit background task")     }   }