Yes I get it's rare but I've done several runs all HM recently, 15-20 and not one person in my group has gotten one in any of the runs. Usually I'd see someone get one in my group every couple runs but either RNG is complete garbage for everyone or something's wrong, not seen one drop for anyone in 2-3 days and still don't have it myself. Feels like I'm completely wasting my time when none are dropping for anyone in so many runs.