Pet bug ?
I used most of my pets and killed a chaos hare, then i died to a chaos squirrel, when i re-spawned at home, and summoned my pets to sit them by the fire, all of them now have 0% hp and will not gain any more, some will allow me to ride them but not show up on screen, others will not allow me to target them, none of them died during the fight, i sent them home at 14/th hp, I have logged fully out and back in a few times, but they are still broken