I've had several dark compass drop today. Keep trying!
I also was getting a compass about third or fourth collection & haven't had one now in at least a dozen collections. Seems unusual, will keep trying.
I've had 2 from 6 collections (3 of each Mine).
The fangbeasts are dropping bottles again too.
At least two and possibly more collections from the study circle gave zero compasses from all three of the study circles. The mines at least dropped one. I need a bunch to craft the spellbook.