I have the same problem on two iMacs and a MacBook Pro M2
Rebooting does not help solve the problem.
Wallpaper loading starts and stops at 20 percent
ErmesVitoldov
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution