Wallpaper-only windows for secondary monitors were on Layer::Top — same layer as the greeter window. Since they were created after the greeter, they occluded the login UI, leaving only the wallpaper visible.
Wallpaper-only windows for secondary monitors were on Layer::Top — same layer as the greeter window. Since they were created after the greeter, they occluded the login UI, leaving only the wallpaper visible.