OS: OpenSUSE Tumbleweed
Desktop environment: SwayWM

I believe this is a bug of SDL2 instead of Daemon, but I hope someone here could identify the bug and file a bug report to the SDL2 repo.

Under wayland (SDL_VIDEODRIVER=wayland), after switching to other windows and switch back to Unvanquished, the character won't move continuously when I keep pressing a movement key, such as W. Instead, a "key up" event is triggered shortly after the key is pressed.

The problem is fixed under xwayland (SDL_VIDEODRIVER=x11).

I tried to look into the source but I am not familiar enough with the engine and SDL2 so I cannot locate the exact problem.