Noticed that if you try to remove Book and Quill (empty or filled with text) several times from a Lectern — it will disappear after some time. I tried to search around the area but no luck. Restarting the world didn't help. Using Item Frames instead of Lecterns for now.
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki