Ok, solution was to delete everything from:
~/.thumbnails
~/.cache/thumbnails
After the reboot thumbnails were present in thunar and ristretto.
Also the problem with the desktop wallpaper changer seemed to be working too.
** Changed in: xfdesktop4 (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1768361
Title:
Can't select new wallpaer from alternative directory
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