Waystone From Last Rare not dropping

As title. Map was Augury. Map had a breach which I cleared upon encountering at about 1/4 into the map. Last rares in central area drop no waystone. Did not get a waystone drop in the entire map. Killed 100% of monsters.


Sidenote: Please get rid of this map. The layout makes Breaches and Expedition and Rituals all miserable.