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.