This needs to be a top priority to fix, this nearly renders survival unplayable.
Not going to lie this is very amateur stuff. Doesn't seem like they even tested the build before releasing, very easy to find. Seems that moving turns off a programed timer to prevent such spamming. Reminds me of why you can play older versions on "java edition" in the first place. Please be more thorough in the future mojang, I was really looking forward to playing this tonight.
Observation for book & quill
Using a censored word seems to trigger this issue.
Two things seem to occur:
-The affected page will no longer be able to use line breaks.
-Writing on another page will cause the affected page to go blank.
Deleting the affected page will allow the book to maintain its structure.