Infinite Xp Glitch In Furnaces

There is a way to get infinite xp inside of a furnace.

To Reproduce:
1. Put a stack of any ingot (preferrably gold) in your 3rd inventory slot.
2. Open a furnace and click on the ingot in your third slot.
3. You get given free XP, you can spam click the item to get lots of Xp.