[0.86][Bug] A Spider's Nest (the Crone) quest is broken

The quest calls for you to defeat widow spiders in ther lairs for their silk and initially spawns one lair on the map. I defeated it and another spawned. I defeated it with another champion and another spawned. After going on this way and defeating the 3rd (or 4th, can't remember exactly) lair nothing else happened. The quest did not finish and I did not get the reward (an enchanter champion joining). Now it is just sitting there in my log as an open quest with no further instruction on how to complete it and no further spawned spider lairs to defeat on the map. I tried moving a champion over the initial quest location to see if that would trigger completion but it did nothing. The quest appears to be broken.