SUMMARY
When configuring the Wallpaper type "Slideshow" (in KDE Plasma on Manjaro), changing the "Dynamic Mode" (or "Sort Mode") dropdown setting does not trigger the "Apply" button activation. Furthermore, even if the "Apply" button is forced to activate by changing another setting (like background color), the "Dynamic Mode" change is NOT saved and reverts to default after closing settings.

STEPS TO REPRODUCE
1. Right-click on Desktop -> "Configure Desktop and Wallpaper".
2. Set Wallpaper Type to "Slideshow".
3. Add a folder containing wallpapers (or rely on default).
4. Try to change the "Dynamic Mode" dropdown setting (e.g., from default to "Time of Day").
5. Observe that the "Apply" button remains inactive (grayed out).
6. Change another setting (e.g., Background Color) to force the "Apply" button to become active.
7. Click "Apply" and close the window.
8. Reopen the configuration window.

OBSERVED RESULT
The "Dynamic Mode" setting has reverted to its previous state. The change was not written to the config file.

EXPECTED RESULT
The "Apply" button should activate immediately upon changing the dropdown. Clicking "Apply" should persistently save the selected Dynamic Mode.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro Linux
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION
This issue prevents users from forcing "Time of Day" mode for dynamic wallpapers inside a slideshow when using a dark system theme during the day.