Crushing Leap Lasts infinitely long

I'm farming Harvest with maximum attack and cast speed on the map to make the boss mobs phase faster since they get stuck not phasing for a minute or more wasting everyones time (still not fixed btw) but I found another bug while farming this.

The crushing leap modifier on delerious mobs is supposed to have a duration, but it lasts after the mob is dead and after the delerium is ended in some of my maps, not all of them. If I run away from the apparition, it will go away, otherwise it will continue to smack me forever. It also seems to stack up over time. I had 4 instances of them jumping around at once.

I'm using max explicit mod effect and a sinistral scarab to max the hasted mods. I think its resetting its cooldown before it can fade.

In the instance where I noticed the bug most recently it was affected by wildwood wisps as well so that may be a factor in getting it to trigger.

Update: it always happens when the map rolls 110% increased cast speed. wisps were irrelevant. so is attack speed.