Regardless of trades, naming Villagers, spawn proofing, commands, gamemodes, difficulties, bed placements and workstations, or light levels, every single Villager I encounter has had a tendency of becoming completely erased after exiting a world, leaving Minecraft, and reopening Minecraft to return to that specific world. The game pretending that the Villagers never existed.
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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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