I have a lvl 54 Crusader and when I using the falling sword abillity with the Rise brothers rune, the stack of Pandemonium communtity buff completly falls off.
I seen it over and over again although the buff timer was far from depleting.
This is tested in a single player game.
I also tested it with the superheated rune but with this it doesn’t drop the stacks.
there seem to be plenty of things that can drop the buff.
I also reported already that it occasionally drops immediately when changing rift/GR floors (I notice it mostly when a speed pylon is active).
doesnt seem to bother anyone. don’t understand cus this all would need a fix in my opinion.