macOS issues with multiple screens

[OfficialCRUGG]

Not sure if this is just how macOS handles wallpapers, or with the implementation, but:

When changing the wallpaper, all active screens have the new wallpaper. But when using a different monitor, that one still has the previous wallpaper.
Also, sometimes just unplugging one monitor can make macOS recognize some of the monitors left as different ones causing this issue too it seems?!