I will preface this with I don't think this is an urgent issue.

While working on a personal pack, I attempted to add the tamable mobs from Alex's Mobs to the taming XP reward list, which it would not reward, I have also told the Project MMO devs about this, with a general user on their discord suggesting I leave you a message as it is "Highly possible its just not firing the correct events to the forge bus"

Any help would be appreciated. Thanks in advance.