So, me and my friend have a server running Minecraft release candidate 1. Only we can join. i went to trade and the villagers had simply disappeared. Its all closed in and protected so a zombie wont have killed them. They had really good trades. This happened again once we got some more. There is no log files about this issue. Then we made a new Minecraft word to test it out. and sure enough, they'd disappeared. This also happens in local worlds.
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However, we are already tracking this issue, and this report is a Duplicate of MC-153904, which is a report that has not been resolved yet.
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