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When you find the cape, if you then try to unequip it (by clicking on it with an empty mouse hand), then it vanishes and so makes the game incompletable.
What I'm not sure of is if it's a bug in the dungeon or the engine!
The cloak has, at least in my estimation, a perfectly valid CONVERT_UNEQUIP method. It also worked properly in beta versions. (Though I didn't test it recently, to be honest)
I think this is a bug in the engine. I've made a minimalist example dungeon and sent it to you.
In the meantime, for DP players: Do not unequip the cloak.
There's never a need to, fortunately, so the game is still solvable.