Title bar API causes apps to crash on Windows 10 (less often on Windows 11)

[wbokkers]

Describe the bug

On Windows App SDK 1.5.8 (and possibly on 1.6 as well) users experience crashes in (child) windows using title bar customization.

Steps to reproduce the bug

1. I have this code in the constructor of a Window:

     if (AppWindowTitleBar.IsCustomizationSupported())
     {
             _appWindow.TitleBar.ExtendsContentIntoTitleBar = true;
             _appWindow.TitleBar.IconShowOptions = IconShowOptions.HideIconAndSystemMenu;
     }

2. User opens (closes?) this Window
3. The app crashes on Windows 10.0.10945.5131 (But sometimes also on newer Windows 11 versions)

Expected behavior

No crash

NuGet package version

WinUI 3 - Windows App SDK 1.5.8

Windows version

Windows 10.0.19045.5131 (frequent). On Windows 11 less often.

[github-actions]

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Open similar issues:

• App with custom titlebar crashes after a window is closed. (#10074), similarity score: 0.83
• ExtendsContentIntoTitleBar causes the crash of the app when closing in minimized state (#10103), similarity score: 0.82

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[wbokkers]

I can reproduce one situation on my end:

Enqueue method to show the window with the adapted titlebar
Immediately afterwards enqueue method to close the window (window.Close)
Immediately afterwards enqueue method for showing the window again

This will often result in this crash:

[karkarl]

I have also been reproing this issue, and have started a thread with the AppWindow folks on this.