RadioButtons SelectionChanged trigger twice

[HO-COOH]

Describe the bug

This has been an issue in UWP in #3128 , and someone was even kind enough to make a PR to fix it #3137 , but you guys just closed it because winui2 is no longer developed? And don't even check for it in winui3? So I just wasted another hour stumble upon this issue in WinUI3.

Steps to reproduce the bug

1. Create a new winui3 project
2. In MainWindow.xaml use this code

    <RadioButtons SelectionChanged="RadioButtons_SelectionChanged">
        <RadioButton Content="Item1"/>
        <RadioButton Content="Item2"/>
    </RadioButtons>

3. In the handler code, just add a debug print.
4. The initial selection will trigger it once as expected. Select another item, this event handler will be triggered twice.

Expected behavior

No response

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.5.6: 1.5.240802000

Windows version

Windows 11 (22H2): Build 22621

Additional context

Repro