The Bug:

Collecting books from chiseled bookshelves in creative mode grants the book even if it's already present in your inventory.

Steps to Reproduce:

1. Switch to creative mode, obtain a book, and place down a chiseled bookshelf.
2. Place the book onto the chiseled bookshelf.
3. Collect the book from the chiseled bookshelf.
4. Take note as to whether or not collecting books from chiseled bookshelves in creative mode grants the book even if it's already present in your inventory.

Observed Behavior:

You are granted the book even if it's already present in your inventory.

Expected Behavior:

You would only be granted the book if it isn't present in your inventory.