Grindstone naming Enchanted Books

I was using a grindstone on my enchanted books to get some xp levels. I put the enchanted book into the grindstone and it returned a normal book with a name: Enchanted Book

Expected: A normal book

What actually happened: A normal book named Enchanted Book

How to reproduce: Use an enchanted book in the grindstone. Output is a renamed book with the name Enchanted Book