ATT permission alert is not showing at serial permission prompt flow

First, I code ATT authorization struct below which uses brand new Swift concurrency.

struct ATT {
    private init() {}
   
    static func permissionRequest() async -> Bool {
        switch ATTrackingManager.trackingAuthorizationStatus {
        case .notDetermined:
            await ATTrackingManager.requestTrackingAuthorization()
            return ATTrackingManager.trackingAuthorizationStatus == .authorized
        case .restricted, .denied:
            return false
        case .authorized:
            return true
        @unknown default:
            fatalError()
        }
    }
}

And Video authorization as well.

struct Video {
    private init() {}

    static func permissionRequest() async -> Bool {
        switch AVCaptureDevice.authorizationStatus(for: .video) {
        case .authorized:
            return true
        case .denied, .restricted:
            return false
        case .notDetermined:
            await AVCaptureDevice.requestAccess(for: .video)
            return AVCaptureDevice.authorizationStatus(for: .video) == .authorized
        @unknown default:
            fatalError()
        }
    }
}

Next, I request two permissions in serial, and works as I expected.

Remember uninstalling the app to reset those permissions status.

@IBAction func onClickButton(_ sender: Any?) {
    Task {          
        _ = await ATT.permissionRequest()  // okay
        _ = await Video.permissionRequest() // okay
    }
}

Lastly, I replace those order, and ATT alert is not showing this time.

That’s not what I expected.

Why ?

@IBAction func onClickButton(_ sender: Any?) {
    Task {          
        _ = await Video.permissionRequest() // okay
        _ = await ATT.permissionRequest() // not showing
    }
}

And I noticed this would happen again when I called this from viewDidLoad()

override func viewDidLoad() {
    super.viewDidLoad()

    Task {
        _ = await ATT.permissionRequest()  // not showing
    }
}

Seems like this behavior is since iOS 15 beta 3.