We've been on this world for months and had no major problems and then villagers we have cured, some keep despawning and then we got more and it was fine for some time and then we logged in today (9th July) and I went around to trade with some of our cured villagers and 8!! of our villagers were gone! It had happened before and thought nothing of it but losing 8 at once is heartbreaking when its hard to cured and find them first.
Related issues
Comments

Thank you for your report!
We're tracking this issue in MCPE-21416, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 BDS Wiki – 📖 FAQs