Acr.UserDialogs not working with Xamarin.Forms above version 4.4.0.991864

Hi
I'm using Acr.UserDialogs (https://github.com/aritchie/userdialogs)
in a Cross Platform Project to show Toasts and loading-boxes (UserDialogs.Instance.Loading),
but the UserDialogs.Instance.Loading is not working in UWP with a higher version of Xamarin.Forms than 4.4.0.991864.
With version 4.4.0.991864 it all works fine.
Does anybody know about this problem?

Here's an example where I use it for awaiting loading a new page

using (UserDialogs.Instance.Loading("Loading", null, null, true, MaskType.Black)) { await Task.Delay(100); } await Navigation.PushAsync(new HandlePartPage()); UserDialogs.Instance.HideLoading();

Friendly greetings
nbs