Temple room stuck

Hall of Shadows in an Atziri's temple, after clearing all mobs inside the room, Zoltec the High Priest seems to be in a weird phase where he is invisible , unhittable but has kind of a hitbox, not able to take any damage but I can see his health bar; doing a weird rock breaking where he can deal damage to me but i cannot do any damage to him. I tried leaving the temple and coming back, i tried dying to him and coming back , doing damage on the ground with poison even other types of damage, nothing seems to make him stop that weird phase of his. Bug reference number 421,921,497