I have this exact issue, after an update around the same date.
I can see the images are copied to /home/<username>/.local/share/shotwell/wallpaper/ and the XML is created with correct paths but that's it.
The wallpaper is not changed nor is the slideshow added to the list of wallpapers.
There's no .local/share/gnome-background-properties folder, either (which is where the configuration would be, apparently). I had to manually place an XML file inside the gnome-background-properties folder to make it work
I have this exact issue, after an update around the same date. username> /.local/ share/shotwell/ wallpaper/ and the XML is created with correct paths but that's it.
I can see the images are copied to /home/<
The wallpaper is not changed nor is the slideshow added to the list of wallpapers.
There's no .local/ share/gnome- background- properties folder, either (which is where the configuration would be, apparently). I had to manually place an XML file inside the gnome-backgroun d-properties folder to make it work