View appearing on the background when using Task.Run

I'm trying to make a Loading View by adding a IsLoading parameter to a custom ContentPage and when set, a View with some Labels and a ActivityIndicator appears on top. Here is the custom page:

public class PageWithLoading : ContentPage, INotifyPropertyChanged
    {
      private bool isLoading;
      public bool IsLoading
      {
        get
        {
            return this.isLoading;
        }

        set
        {
            this.isLoading = value;
            RaisePropertyChanged("IsLoading");
        }
    }

    private string _subtitle;
    public string subtitle
    {
        get
        {
            return this._subtitle;
        }

        set
        {
            this._subtitle = value;
            RaisePropertyChanged("subtitle");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    public void RaisePropertyChanged(string propName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
    }


    public PageWithLoading()
    {

    }

    public void Loading(bool loading, string text = "")
    {
        IsLoading = loading;
        subtitle = text;
    }
}

If I make a Page that inherits from this, and set IsLoading = true, this should appear:

<AbsoluteLayout x:Name="loadingView" AbsoluteLayout.LayoutBounds="0,0,1,1" AbsoluteLayout.LayoutFlags="All" IsVisible="{Binding IsLoading}">
     <ContentView BackgroundColor="#222222" Opacity="0.75" AbsoluteLayout.LayoutFlags="All" AbsoluteLayout.LayoutBounds="0,0,1,1"/>

      <StackLayout BackgroundColor="White" AbsoluteLayout.LayoutBounds=".5,.35,.85,.85" AbsoluteLayout.LayoutFlags="All" VerticalOptions="Center">
       <Label Text="Carregando" FontSize="35" FontAttributes="Bold" VerticalOptions="Center" HorizontalOptions="Center" />
     <ActivityIndicator IsRunning="true" />
       <Label Text="{Binding subtitle}" FontSize="20" VerticalOptions="Center" HorizontalOptions="Center" />
     </StackLayout>

    </AbsoluteLayout>

And it works if I try to test with something simple, like:

Loading(true, "Logging in");

            await Task.Delay(3000);

            Loading(false);

but if I try to actually load something (in this case using two task to get some objects from a DynamoDB table) the view doesn't appear, but it seems to be under the rest of the page since you can see a glimpse of it when the page changes