After using a Grindstone to remove an unwanted enchantment from a book and get some experience back, I noticed that the plain book left behind wouldn't stack with my other books in my chest. I then noticed that it still had an NBT tag, shown in screenshot 1.
Looking in my inventory using NBTExplorer showed that this tag is a RepairCost value of 0.
Further testing in creative had the same thing happen every time, also revealing that the NBT-tagged books stack with each other, but not regular crafted books (which is expected since the minecraft:book item can stack).
Simply having the grindstone remove this tag as well if a book is used should be simple enough with no negative effects, since the RepairCost tag is useless on a regular unenchanted book. These de-enchanted books can be re-enchanted without issue, so the issue is mainly with item stacking.
This issue wasn't present before Pre-Release 3 because enchanted books weren't able to be de-enchanted with a grindstone due to a now-fixed bug.
Linked issues
is duplicated by 28
MC-148514
Disenchanted books keep NBT tag
Resolved
MC-148575
Books disenchanted with a grindstone won't stack with books that were never enchanted.
Resolved
MC-148628
In pre-rlease 4, books that are disenchanted have an extra tag, seperating them from regural books
Resolved
MC-148686
Books obtained from grindstone have NBT
Resolved
MC-148784
Disenchanted books not stacking with regular books.
Resolved
Attachments
Comments 6
This error can cause the Crafting Manual in your inventory to not use items that were previously enchanted (such as bows for dispensers). I recommend that a mod link MC-149881 to this thread because it not only effects books.
@unknown, your issue is MC-151062.
This is still happening in 1.14