user psi_lion on May 24, 2022
Reboot your computer
Don't switch virtual desktop during next steps
Open settings and set background to slideshow
Open registry editor and remove key "Wallpaper" in each subtree in \HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\VirtualDesktops\Desktops\ (each subtree is one virtual desktop)
Reboot the computer again
Right-click somewhere on wallpaper and click "next desktop wallpaper"
Now you can safely switch desktop or reboot your computer.