I have received reports that while using mouse and keyboard control scheme, the cursor might move uncontrollably. It seems to be caused by certain software that sends controller button and axis signal using channels beyond the supported 4 in the game, thus interfering with the game's cursor.
In an attempt to resolve this issue, I have disabled cursor movement by joystick axis input (can be from any peripheral device) when the control scheme is not set to "Controller". The cursor movement by joystick is still enabled at all times for Steam Deck which is unlikely to run any software mentioned above.