[Bug] [Android] ShellContentPage ContentPage.ToolbarItem not rendering

Description

Adding a toolbaritem to ContentPage of ShellContent Route not showing at toolbar. When navigate using bottom navigation of Shell TabBar at Android, ToolBarItem show a blink and disappear.

Steps to Reproduce

1. Create new Maui project
2. Add new Xaml-Page
3. Add ContentPage.ToolbarItems to the newly created page
4. Replace content of MainPage with a Shell
5. Add the xml-Namespace xmlns:local=“clr-namespace:cvmaker”
6. Add Tab to the Shell with ShellContent ContentTemplate=“{DataTemplate local:HomePage}”

Version with bug

Preview 10 (current)

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android 11

Did you find any workaround?

no

Relevant log output

no

[Epictek]

I discovered a workaround for this, It seems adding the ToolbarItems after the page has rendered works.

        protected override void OnAppearing()
        {
            base.OnAppearing();

            _ = Task.Run(async () =>
            {
                await Task.Delay(1000);
                
                MainThread.BeginInvokeOnMainThread(() => {
                    this.ToolbarItems.Clear();
                    this.ToolbarItems.Add(new ToolbarItem() { IconImageSource = new FontImageSource() { Glyph = "\ue145", FontFamily="MaterialIcons" } , Text = "Add", Command = ((ListPageViewModel)BindingContext).AddCommand });
                    });

            });
        }

[sharpwood]

Did you test it use Shell ContentPage? Shell ! @PureWeen