The problem: - If you have x monitors with only 1 virtual desktop: in the wallpaper options, right click you can send the image to either monitors you have (ie: set for monitor 1 / set for monitor 2 ...etc) But - If you have x monitors with y virtual desktops enabled: the option just vanished. You can now with the right click only define one wallpaper by virtual desktop (ie: set for all / set for desktop 1 / set for desktop 2)
Did you have a bypass for this bug? Is it taken into account somewhere to be treated?
Currently the only solution is to kill every vd, then change wallpaper for each monitors, and finally create back new vd.
I've had the same behaviour, though not even sure whether to call it a bug or a design issue. Could do with a more proper wallpaper utility where you can see a mini-grid of all monitors in a row, then each virtual desktop on subsequent rows so you can pick wallpapers for each if you so desire, or entire rows or columns.