Book and Quill crashes game when going backwards to a page with text on it. I have left instructions to reproduce this bug in 20w17a.

1) Make a world

2) Get a Book and Quill

3) Write things into the Book and Quill

4) Go to a further page

5) Go back to the page with writing

6) Your game will now freeze and crash

I have only seen this bug in multiplayer before now.