Pony Fantasy VI Remake

I think the problem is it's still counting "Gau" as undead even after dying.
There might be a patch somewhere that clears "Gau's" statuses on death so things like element weaknesses and resistances as well as undead get cleared upon getting KO'd.
As least I'm pretty sure something like that was done for Brave New World if I recall correctly.
I hope that helps somewhat as I don't really have any hacking knowledge beyond what's happening on the surface level.