Description

Setting [Shell.TabBarBackgroundColor] on the Shell element has no effect on MacCatalyst(version 26). The tab bar remains the default system color.

Expected Output	Actual Output (Mac 26)

Steps to Reproduce

1. https://github.com/dotnet/maui/blob/f8cb875eeec2dff76dd158e21634d3216ddc2edd/src/Controls/tests/TestCases.HostApp/Issues/Issue16522.xaml
2. Observe the Shell.TabBackgroundColor is not applied.

Link to public reproduction project repository

No response

Version with bug

10.0.60

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

macOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output