Psychotoxic Level 21B Problem

[mfw41]

I'm replaying Psychotoxic after a couple of years and now I'm stuck the the second last level of the game(21B) but due to a bug I think. Each time when the level loads up I immediately die because I my characters drowns in a liquid that immediately fills up the hole the character's in and i have to go up some stairs to escape this fole but as I stated the hole immediately and quickly fills up and she drowns. I remember playing this level but I don't remember if I had this problem or not.

One other thing I can't enable cheats quickly enough to stop my character from dying, even if I Copy&Paste the cheat.