Yesterday I ran Labor Shortage on my level 15. A mephit dropped a purple bag. I clicked on it -- mostly out of habit, since I never get anything out of these bags in Extraplanar Palace. To my surprise, I got Luminescent Dust. Does it mean Turbine fixed monster's drops in Challenges, or were mephit drops never bugged in the first place? Purple bags from wolves in Lava Caves always worked, AFAIK.