Affects Version/s: Minecraft 1.14.1 Pre-Release 1, Minecraft 1.14.1 Pre-Release 2, Minecraft 1.14.1
Fix Version/s: Minecraft 1.14.2 Pre-Release 1
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