Sometimes when I spawn near a village I go near it and there will be only like 3 or 4 villagers. Also if I leave a village with a lot of villagers for a long period of time i'll go back to that village and all of the villagers will have disappeared. I've tried breeding them but that also doesn't work because they still disappear after a while.
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We're tracking this issue in MCPE-21416, so this ticket is being resolved and linked as a duplicate.
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Villager despawning randomly affected villages has happened in 1.13, as well. Villager spawning when the village generates is affected by the number of beds in the village.