When villagers appear on beds in their homes, they get stuck in roof blocks.
DECISION:
The solution to this problem is very simple. Increase the village houses slightly in height and slightly in width.
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However, we are already tracking this issue, and this report is a Duplicate of MC-146770, which is a report that has not been resolved yet.
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I've seen this happen on our vanilla server more than once.
I disagree with the suggested solution. That's just a work-around