The Book & quill was turned Invisible, You need Keyboard and Mouse to reproduce these steps. Get Book & quill, write anything on Page 2-3 or anything, If you are done writing, do not save your Writing ( Which you Press ESC, Exit button, or Paging Arrow button) Guide your Cursor to the Left or Right Arrow page button, and press ENTER on your keyboard to go back Previous or Next Page, these result that Current page was glitching and it still saves the Text, if you go back to Current page, you Notice there's Invisible text, to Reveal the text, press Left click on your mouse.

Step to Reproduce:

1. You need Keyboard and Mouse to reproduce these steps
2. Get Book & quill
3. Write anything on Page 1-2 or Page anywhere
4. If your Writing is done, Guide your Cursor to the Left or Right Arrow Paging button
5. Press ENTER on your Keyboard
6. Go back to your current Paging
7. Reveal Invisible Text by Left click on your mouse

Observed results:

The text was turned Invisible which Steps 4 and 5 was used glitched

Expected results:

The Text is supposed to be not Invisible

See Video link:

https://youtu.be/S6-qIcQV2AM Step to reproduce 

https://youtu.be/Jf_HG8va3bE Showcase

Note about Video: I use Page 2-3 instead of 1-2, this also include issue.