On my iPad, I have a large hall built with villagers in it. There is no way for them to get out, I activate a piston trapdoor to get in. Villagers that I have traded with disappear regularly. I believe the structure is on a chunk border.
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We're tracking this issue as MCPE-21416, so this ticket is being resolved and linked as a duplicate.
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happens to me occasionally, even in 1.12 and 1.13. I play on peaceful and villagers are all underground, no way to escape except through trapdoor, which they cannot open.