frost fang and vampire familiar dont work on the crow from the alex mobs

[Hubertdradon]

So I was trying out the enchantments from this mod with the animals that are found in the Alex mobs mod and I discovered that if the crow with the frost fang and vampire familiar enchantment on the collar hits an enemy it does not heal the crow or apply powdered snow effect only when I attach enchantment shadow hands the crow was healing himself and applying the powdered snow effect please fix this