If you load in an old world while using the latest snapshot(20w07a) Villagers will guarantee to despawn. People who play survival on this version are likely to suffer from this bug the most.
MC-172227
Villagers despawn when loading an old world
Resolved
Duplicate
0
Thank you for your report!
We're actually already tracking this issue in MC-172078, so I resolved and linked this ticket 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 in the future to see if the issue has already been reported.
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