SDL on Wayland leaves surface around
Starting and then closing d2x-rebirth (a SDL2 game) with SDL_VIDEODRIVER=wayland causes its fullscreen window to be left around in the upper left quarter of the screen. It's drawn on top of everything else, even the lock screen, and stays until the shell exits.
gnome-shell 3.32.2-1-g24cb1c1aa
mutter 3.32.2-11-ga3a97621
sdl2 2.0.9
d2x-rebirth 0.60.0-beta2-384-gd5510bfc8
Arch Linux
One monitor, 3840x2160 @ 200%, scale-monitor-framebuffer
Closing ScummVM, Xonotic or OpenTyrian in fullscreen mode triggers the same issue.
Closing BZFlag doesn't trigger it, but this game doesn't destroy its Wayland objects on shutdown and just exits immediately.