On occasion, when I load my world, one or more (often more) of my villagers will have been completely removed, regardless of if they were traded with. Other entities like Minecarts and Boats will also have vanished without a trace, breaking my Farms and builds. any new villagers i cure from zombie spawners also cannot change profession (I have not traded yet prior to attempting to change their jobs) and these malfunctions did NOT happen prior to the most recent update.