Have emerald fangs slotted in serpent strike with a primal serpent on the field. I noticed I was getting no frailty procs on any enemy units. I’m pretty sure this is the bug:
If the serpent has been summoned in the zone Emerald Fangs functions as intended. I confirmed this worked in combat zones, including zones which previously had a carried over primal serpent (that was then removed and a new one was summoned).
If the serpent has been carried over from another zone Emerald Fangs does not function, or at least does not inflict frailty, I had innate on poison hit so wasn’t sure about that effect. I confirmed on a dummy no frailty procs.