On a Realms sever that I play on that isn't owned by me, after writing in book and quill, then quitting to the title screen, then reopening the book, certain words and phrases, particularly with the names "Mark" and "Ryan" get censored as hashtags. I don't know of any offensive phrases with these words so I assume this is a glitch. After manually re-typing the phrase, the same phrase gets censored again the next time I enter the world.