Cow Stampede Enchantment Behaves Weirdly

I was fighting the Prima Enchanter, and at first the piston launch pads were bugged, sending me flying into the center of the battlefield to my death. I got it to work by rolling, and afterwards, I used the cow stamped against the Prime Enchanter (It was at almost full health) and it just immediately died, and there weren’t any reward spawns (Still got the achievement though). Although the bug was pretty funny, I still do hope that it is fixed so that I can fight the Prime Enchanter again, fairly this time.