While you are in Creative Mode, removing a book from a lectern removes the book, but also destroys the lectern.

Steps to Reproduce:

1. Go into Creative Mode
2. Write anything in a book and quill, then sign and close it.
3. Place the written book in a lectern
4. Remove the book from the lectern

Expected Results:
The book gets removed, and drops as an item.

Observed Results:
The book gets removed, but the lectern also gets destroyed.

Notes:
Just like the other two bug reports I made, REALMS-10464 and REALMS-10477, all of these have to do with the fact that they all involve blocks that change states when you left-click on them. All of them, when left-clicked, activate their left-click functionality twice. They could in fact all be the same bug, considering those bugs have been introduced at the same time.