Relates to:

• MC-80096

Can be caused by:

• MC-79820

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:

• Dropper
• Dispenser
• Hopper
• BrewingStand (simply don't work)
• Using the item
• Furnace

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.

How to reproduce:

1. Use

   /summon ArmorStand ~ ~ ~ {Equipment:[{id:stick,Count:0}]}
   

2. Right click the ArmorStand
3. Place the stick in the furnace (do not right click with the stick)