Unlimited XP bug

I created a kelp farm and was drying stacks in a furnace.

When I went to remove the stack of dried kelp, I heard the “ding” indicating I had received experience, but I accidentally tapped a stack that was already in my inventory and so the two stacks just switched places...but I heard another ding...

 

I sat there and earned two levels of experience just swapping the stacks back and forth, and as much as I’d love the free XP, I don’t think it’s what you intended.