Book and quill text disappears after exiting book

I'm trying to write something in a book, but when I exit the book and go back in, the text is gone! I originally came across this problem on a Realm, but the bug didn't appear in a single-player world when I tested it. More interestingly, when I exited the realm and rejoined, the book text stopped disappearing. I don't know if this was just something weird with my wifi connection, but I think it should still be looked into. I did manage to get a recording of the bug when it was happening though: 8mb.video-6lZ-IVS6Omwf.mp4