Xamarin.forms: [Bug] Shapes not loading in Xamarin ShellContent Tab once it is navigated back from other Tab

[martinkabraham]

Shapes not loading in Xamarin ShellContent Tab once it is navigated back from other Tab

Steps to Reproduce

1. Create a Sample Xamarin Shell application with 2 tabs
2. In one of shell content Page Create an Ellipse shape
   [ />]
3. Navigate between Pages-- Shape will not render for second time.

Expected Behavior

Shape Should render

Actual Behavior

Shape is not rendering

Basic Information

Shape is rendering Xamarin Shell only by InitializeComponent()

• Version with issue: Xamarin Forms 4.8.0.1269
• Last known good version:
• IDE: Visual Studio 2019
• Platform Target Frameworks:
  
  
  
  • iOS:
  
  
  • Android:
  
  
  • UWP:
  
  
• Android Support Library Version:
• Nuget Packages:
• Affected Devices:

Screenshots

Reproduction Link

Workaround

Create Shape from Code Behind and insert it into layout OnAppearing()
public partial class HomePage : ContentPage
{
Int16 init = 0;
public HomePage()
{

        InitializeComponent();

        BindingContext = new Empower.ViewModel.HomePageModel();
        // var point = new Point(0,0);
        // pancakecolors.BackgroundGradientStartPoint = point;
        // pancakecolors.BackgroundGradientEndPoint = new Point(1, 1);

        init = 1;

    }

    protected override void OnAppearing()
    {
        if (init == 0)
        {

            Ellipse _elpseShape = new Ellipse();
            _elpseShape.Fill = Brush.White;
            _elpseShape.HorizontalOptions = LayoutOptions.Center;
            _elpseShape.VerticalOptions = LayoutOptions.Center;
            _elpseShape.WidthRequest = 80;
            _elpseShape.HeightRequest = 80;


            grdmyaccount.Children.RemoveAt(0);
            grdmyaccount.Children.Insert(0, _elpseShape);
        }

        init = 0;


    }


}

[jsuarezruiz]

Attached reproduction sample
Issue11924.zip

[patrickhacens]

I have the same problem with Path at even times a page with appears

var page = (page with Path);

Navigation.PushAsync(page); //it appears;
Navigation.PopAsync();
Navigation.PushAsync(page); //it does not appear
Navigation.PopAsync();
Navigation.PushAsync(page); //it appears again
and so on

[luismts]

+1 experiencing the same issue with tabs in Shell.

[Confusedfish]

I too am hitting this same issue and am on 5.0-pre3. Only occurs following navigation, initial drawing is fine.