You'd need to talk to the one who created that mod, not the game's creator.
Actually, I encountered this problem myself as I was trying to learn how to mod for this game. The victory scene I added into monsteraddition file and worked in a previous version stopped working from 25.7 onward, and I copied the exact code into the game's monster file and it works. So I thought something went wrong with the game.
Guess I'll have to hunt down a mod that use monsteraddition to add victory scene and see what I did wrong.