The foreground of the caption buttons don't update on theme change if the app is minimized

[eduardobragaxz]

Describe the bug

If you change the system's theme from light to dark or vice versa, and your app is minimized, the caption buttons' foreground won't update.

Steps to reproduce the bug

1. Minimize the app;
2. Change the system's theme;
3. Bring the app forward again.

Expected behavior

No response

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.5 Experimental 2: 1.5.240124002-experimental2

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response