In a book and quill, the spacebar switches pages after the first page

I was testing out the new 1.14 snapshot for Minecraft Java Edition, and I found the lectern in the creative inventory, so I thought I'd try it out. I placed it down and started writing in a book and quill. I clicked to go onto the next page, and when I wrote one word and clicked the spacebar on my keyboard, it opened a new page. I kept on pressing the spacebar and it just kept adding new pages. Then I clicked to go to the previous page, and pressed the spacebar some more, and then it went back pages.

 

What I expected to happen was...:

After going to the second page on my book and quill, I should have been able to continue writing normally.

 

What actually happened was...:

On the second page of my book and quill, I pressed the spacebar and it went forward a page instead of adding a space.

 

Steps to reproduce:

1. Get a book and quill
2. Write anything on the first page (if you want)
3. Go to the second page (and write anything if you want)
4. Press the space bar
5. It will create a new page
6. Create a few more pages
7. Go back one page
8. Press the spacebar
9. It will go to the previous page