Background fetch with BGTaskScheduler not being triggered by the debugger

I'm building an app with background fetch following the instructions provided in the BGTaskScheduler documentation, but unfortunately it's not working, and I can't find a way to debug it. The problem is that the launch handler that I'm registering never gets triggered even if I try simulating a background fetch from the debug menu or creating a scheme to launch the app for background fetch. I'm sure that the request method from BGTaskScheduler is returning true because I'm calling it inside an assert and running for debugging, I have also checked whether background app refresh is disabled either for the app or the whole device and it's not. I have even created a small app to use as a minimum working example and it has the same problem so I don't know what to do next.

Here's the code from AppDelegate:

Code Block Swift
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        let taskIdentifiers = Bundle.main.object(forInfoDictionaryKey: "BGTaskSchedulerPermittedIdentifiers")! as! [String]
        assert(BGTaskScheduler.shared.register(forTaskWithIdentifier: taskIdentifiers[0], using: nil, launchHandler: {[unowned self] in self.backgroundFetch(task: $0 as! BGAppRefreshTask)}))
        scheduleBackgroundFetch(identifier: taskIdentifiers[0])
        return true
    }
    private func backgroundFetch(task: BGAppRefreshTask) {
        print(#function)
        scheduleBackgroundFetch(identifier: task.identifier)
    task.expirationHandler = {Client.shared.cancelRefresh()}
        let operation = BackgroundFetchOperation()
        operation.completionBlock = {task.setTaskCompleted(success: !operation.isCancelled)}
        task.expirationHandler = {operation.cancel()}
        OperationQueue.main.addOperation(operation)
    }
    private func scheduleBackgroundFetch(identifier: String) {
        let request = BGAppRefreshTaskRequest(identifier: identifier)
        request.earliestBeginDate = Date(timeIntervalSinceNow: 60.0)
        try! BGTaskScheduler.shared.submit(request)
    }

I'm using Xcode 11.5 on MacOS 10.15.5 and am testing on a real device with iOS 13.5.1.

Can anyone figure out what I'm doing wrong here, or perhaps suggest other things that I should look into and might not be considering?

Thanks in advance!