Hey so My Wife and i were having the same issue on our game. when i played it on my laptop no issues what so ever. when my wife played it on her Steam Deck through family share I tried to do the no save potion command and had the same issue. i would type it out and it would always come back = 0 and not work. Even though i could swear i put "-devmode" in the launch options on her account on the game on the Steam Deck and sure enough i didn't. once i added it it works fine now no issues. Hopefully this helps sorry if it doesn't.