Основы Xamarin Forms - событие OnMainDisplayInfoChanged не сработало Android

Question

Мои режимы Xamarin Forms с переключением режимов Пейзаж в Портрет хорошо работают на iOS.

В Android Я никогда не получаю вызов на событие OnMainDisplayInfoChanged.

public BaseVM()
{
    Connectivity.ConnectivityChanged += Connectivity_ConnectivityChanged;
    IsConnected = Connectivity.NetworkAccess != NetworkAccess.Internet;
    isConnected = CrossConnectivity.Current.IsConnected;
    DeviceDisplay.MainDisplayInfoChanged += OnMainDisplayInfoChanged;
    Title = isConnected ? "Students\r\n(webservice)" :
                                                        "Students\r\n(local cache)";
    IsPortraitMode = DeviceDisplay.MainDisplayInfo.Orientation == DisplayOrientation.Portrait;
    NetAccess = Connectivity.NetworkAccess.ToString();
}

private void OnMainDisplayInfoChanged(object sender, DisplayInfoChangedEventArgs e)
{
    IsPortraitMode = e.DisplayInfo.Orientation == DisplayOrientation.Portrait;
}

Мой MainActivity Decorator выглядит следующим образом

 [Activity(Label = "TripCalculator", Icon = "@mipmap/icon",  Theme = "@style/MainTheme", MainLauncher = true,
        ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, ScreenOrientation = ScreenOrientation.Landscape)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {