I’m using Fedora KDE and the default Fedora wallpaper is appearing, even though I removed the folder. This must be some KDE bug, since it has occurred to me on other distributions as well.
I’ve just tested on a Fedora KDE 42 VM and it is working using your setup (slideshow of images in a subfolder inside my home folder).
I would copy a couple of photos from the default location (/usr/share/wallpapers) to the folder where the other photos reside, and see if those copied photos get displayed. If they do, and the others don’t, then it might be something with the format of the existing photos.
It may be a technicality, but when you delete file, you are only deleting the name that refers to the file. The file itself won’t be deleted until the last process which has the file open closes the file. This has been the case for unix systems since a long time before linux.
I tried to do that but it didn’t help, probably because I didn’t understand it well… But something I noticed was that when I change the global theme to Breeze, what appears in this case is the Breeze wallpaper, so it probably has something to do with the global themes…
Maybe the theme overrides the setting chosen? My test was performed on a vanilla F42 KDE installation. I don’t have access to that VM until next week, so I cannot test your setup ATM.
That must be it… So far I haven’t found any resolution for this.
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I FOUND A SOLUTION!
Actually, what was causing this for some reason was the photos. The reason is that they were probably just too heavy.
What I did was use the “Variety” program to make the slideshow, while in the KDE wallpaper manager I set it as just an image. Then I noticed that when the default wallpaper appeared, in the KDE manager it appeared blank, and bingo! I identified the two images that were causing this. Taking into account the fact that they weighed 60MB and 158MB, then this must have been the reason.