Grindstoning an enchanted book without a custom name names the new (unenchanted) book "Enchanted Book"

1. Craft a new book. It's a book called "Book".
2. Enchant it. It's an enchanted book called "Enchanted Book".
3. Grindstone it. It's an UNenchanted book called "Enchanted Book".

See attachments for a visual explanation.

Seems to be caused by the fix for MC-148529.