NPC Spawn Issue: Droga drop rate fubar'd ?

[Nivar Quartz]

The drop rate at the Soothsayer and Chief camps have dropped 80% plus in the last week or so, was there a ninja patch to correct something in that dungeon and affected the drop rate also? or simply nerfed the drop rate?

I guess I could scrap together some evidence on this but this might have been on purpose and just overlooked in the patch notes or to be included on the next notes?