Villagers disapeared on new snapshot

Logged on today and new snapshot automatically set it. I spawned during the day. I checked my village which is zombie proof and then they just ran inside and disappeared within minutes.

These were zombies living for around 10 days or so after healing from villagers. Breeded other villagers from first initial 2 villagers

It took 1 remaining villager to disappear about 3 minutes after all other villagers disappeared.