[WASM] muxc:TabViewItem.ContentTemplate is not working

[Xiaoy312]

Current behavior

muxc:TabViewItem.ContentTemplate is not working

How to reproduce it (as minimally and precisely as possible)

https://playground.platform.uno/#a6832bb4

<muxc:TabView xmlns:muxc="using:Microsoft.UI.Xaml.Controls" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
    <muxc:TabViewItem Header="content template" Content="is not working">
        <muxc:TabViewItem.ContentTemplate>
            <DataTemplate>
                <TextBlock Text="is working" /> 
            </DataTemplate>
        </muxc:TabViewItem.ContentTemplate>
    </muxc:TabViewItem>
</muxc:TabView>

Workaround

use a ContentControl for Content instead, and move the Content+ContentTemplate onto the ContentControl

Environment

Nuget Package:

• Uno.UI / Uno.UI.WebAssembly / Uno.UI.Skia
• Uno.WinUI / Uno.WinUI.WebAssembly / Uno.WinUI.Skia
• Uno.SourceGenerationTasks
• Uno.UI.RemoteControl / Uno.WinUI.RemoteControl
• Other:

Nuget Package Version(s): Uno.UI.WebAssembly @ 3.7.0-dev.60

Affected platform(s):

• iOS
• Android
• WebAssembly
• WebAssembly renderers for Xamarin.Forms
• macOS
• Skia
  • WPF
  • GTK (Linux)
  • Tizen
• Windows
• Build tasks
• Solution Templates

IDE:

• Visual Studio 2017 (version: )
• Visual Studio 2019 (version: )
• Visual Studio for Mac (version: )
• Rider Windows (version: )
• Rider macOS (version: )
• Visual Studio Code (version: )

Relevant plugins:

• Resharper (version: )

Anything else we need to know?