NumberBox and AutoSuggestBox don't respect IsTabStop="False"

[jb-bcl]

Describe the bug

Certain controls, including but possibly not limited to the NumberBox and the AutoSuggestBox (and not TextBox), fail to respect IsTabStop="False", and will remain as a tab stop.

Steps to reproduce the bug

1. Create a NumberBox or TextBox with IsTabStop="False" specified in XAML
2. Create an element that is a tab stop before this element's effective TabIndex
3. Focus the "before" element and press "tab"
4. See that the element with IsTabStop="False" is functioning as a tab stop

Expected behavior

Elements with IsTabStop="False" should not get focus while IsTabStop is false when the user presses the "Tab" key.

Screenshots

NuGet package version

WinUI 3 - Windows App SDK 1.6.5: 1.6.250205002

Windows version

Windows 11 (23H2): Build 22631

Additional context

Minimal reproducable example available at https://github.com/jb-bcl/repro/tree/main/WinUI3_AsbAndNumberBoxNotRespectingTabStopFalse

[jb-bcl]

Please disregard "effective TabIndex" comments in the above gif, that was left there in error.