Infinite XP Bug

The Bug

Somehow, when you put smelted items into a stack that will go over 64 will not add, and those smelted items will remain in the furnace, but you will get the XP, allowing for infinite XP.

Steps To Reproduce

1. Smelt some stuff that will go over 64 items.
2. When the smelted items has reached 64, go over to the remaining smelted items.
3. With the remaining smelted items, tap the remaining items to the stack of 64 items. Those remaining items will stay in the furnace, but you will get the XP, the more smelted items, the more XP you'll get (You know this already ik), allowing for infinite XP.