When you raise a corpse, you will be able to equip it as you want and it will fall to the floor instead of crumbleing to ashes. If you place a garlic in it's inventory though, it will crumble to ashes once raised (to fight other necromancers).

This is intended to determine what's going wrong if you can't access the inventory of your raised corpses (dead thalls are not suported in this mod yet)