I've experienced this double input from a keypress for some time. Usually it does a double move but so that I can land on the same cell as an enemy. That has been harmless until now I was trying to escape a certain death. I pressed b to move sideways, died, and the double input bug pressed b for death dialog creating a ghost. Now the bug caused harm to other players since I did not intend to leave a ghost behind.
I'm on Windows 11 using Firefox (142.0.1 64-bit) and a bluetooth keyboard if that matters. I haven't noticed this double input in other apps/games.