Sometimes when I have a book and quill and try to delete unwanted text, instead it just removes my onscreen keyboard and doesn't let me make any edits to a certain page. It's kind of inconsistent, as sometimes it will still let me type letters, and other times it won't. Sometimes relogging/restarting fixed it, other times it didn't.

I did play and use a book and quill on a Windows 10 PC though without any problems.

I don't know exactly how to reproduce, but just go on a mobile device, start typing some pages in a book and quill and eventually you may run into some difficulties especially trying to delete text.