After upgrading my underground villager bunker, I have noticed that none of my villagers would restock on their trades even though they physically cannot pathfind to another workbench, and every time I log in it happens again, resulting in me having to break each workbench and slowly work my way through the bunker replacing each workbench as I find the villager who has claimed it.
Very annoying, especially if your trying to get a specific type of villager/trade.
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We're tracking this issue in MCPE-50441, so this ticket is being resolved and linked as a duplicate.
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