SUMMARY
On my second screen, I set Picture of the Day as the wallpaper. However, the picture of the day isn't displayed.

The app is stuck on an old picture. It's possible to force it to display by deleting the cache folder and rebooting/logging out.
However, this method doesn't solve the problem because the picture of the day will still be displayed, but the other images for the following days will be downloaded and never active on the screen. The app will show the same first image downloaded every day on the day the cache is rebuilt.
The provider is Bing, but this applies to others as well.

This observation was carried out over a week.

STEPS TO REPRODUCE
1. set picture of the day
2. wait for 1/2 day
3. observe the 2nd day that your picture doesn't correspond to the one of the day


OBSERVED RESULT
see above

EXPECTED RESULT
the picture of THIS day is the picture OF the day

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.1
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.4-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland

I tried to provide a recording of the bug to illustrate my point but unfortunately the show application crashed several times...