WinUI: TabbedPage pages provided by a DataTemplate crash when swapping to a different tab.

Description

When a TabbedPage is used as the root application page and the child pages are provided using ItemsSource, the app crashes when a tab other than the current tab is pressed.

Steps to Reproduce

1. Create a new MAUI app.
2. Replace App.xaml.cs with this:

public partial class App : Application
{
    public App()
    {
        InitializeComponent();

        var rootPage = new TabbedPage();
        rootPage.ItemsSource = new List<object> { new Vm1(), new Vm2(), new Vm3() };
        rootPage.ItemTemplate = new TabbedItemTemplateSelector();
        MainPage = rootPage;
    }
    public class Vm1 { }
    public class Vm2 { }
    public class Vm3 { }
    class TabbedItemTemplateSelector : DataTemplateSelector
    {
        protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
        {
            if (item is Vm1)
                return new DataTemplate(() => new ContentPage() { Title = "Type 1" });
            if (item is Vm2)
                return new DataTemplate(() => new ContentPage() { Title = "Type 2" });
            if (item is Vm3)
                return new DataTemplate(() => new ContentPage() { Title = "Type 3" });

            return null;
        }
    }
}

1. Run in on Windows and tap for a crash.

Link to public reproduction project repository

https://github.com/Keflon/TabbedPageTemplateBug

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

Latest

Did you find any workaround?

No. If anyone finds one please share here.

Relevant log output

Exception thrown: 'System.ArgumentException' in WinRT.Runtime.dll
WinRT information: The parameter is incorrect.

[jsuarezruiz]

Stacktrace:

   at WinRT.ExceptionHelpers.<ThrowExceptionForHR>g__Throw|20_0(Int32 hr)
   at ABI.Microsoft.UI.Xaml.IFrameworkElementOverridesMethods.MeasureOverride(IObjectReference _obj, Size availableSize)
   at Microsoft.UI.Xaml.FrameworkElement.MeasureOverride(Size availableSize)
   at Microsoft.UI.Xaml.FrameworkElement.Microsoft.UI.Xaml.IFrameworkElementOverrides.MeasureOverride(Size availableSize)
   at ABI.Microsoft.UI.Xaml.IFrameworkElementOverrides.Do_Abi_MeasureOverride_0(IntPtr thisPtr, Size availableSize, Size* result)

[zerihal]

Could not get past this issue with using datatemplate and above workaround is not suitable for my purposes.

Alternate workaround, which did seem to work OK on all platforms was to get rid of the datatemplate all together and just dynamically add the contents of of what was previously ItemsSource to the TabbedPage children in the constructor (retaining the same view model). Not an ideal solution I know, but works for now.