Put the summary of the bug you're having here

What I expected to happen was...:
disenchant an enchanted book

What actually happened was...:
Opened the grindstone interface, placed books in the disenchanting slot, the enchanted book succesufully becomes unenchanted, but it isnt stackable with regural books anymore 

Steps to Reproduce:
1. open grindstone interface
2. place enchanted book in the grindstone
3. get the unenchanted book with an extra tag on it