Can be caused by:
Apparently since 1.8.4 you cannot use negative Count values (or also 0) for items anymore to create infinite dispensers, droppers... (see
MC-80055). I guess this is intended. If so this report is valid.
This seems to affect nearly every block which can reduce the item count:
- BrewingStand (simply don't work)
- Using the item
However the fuel slot of furnaces seems to be the only left out way to decrease the count. Putting an item with count 0 in it, will decrease it infinitely.
- Right click the ArmorStand
- Place the stick in the furnace (do not right click with the stick)