Background changed to older one randomly

This is a repeat of an earlier issue several had a month or so ago, when suddenly the DE background changed to default one after an update.

For me it did something similar but weirder yesterday and today:

I did a kernel update yesterday. After that it randomly booted up with my second-to-latest desktop wallpaper instead of the present one. I manually set it to a new one instead of back to what I had before.

That lasted until today’s update… when it randomly changed BACK to what I USED to have as background before it changed it yesterday. I then changed it back AGAIN, and it has stuck… for now.

I run Xfce, but I believe the last time it happened over several different DE:s.