mobs disappear when changing dimensions specifically the new nether mobs, if a mob does not have a tag it can disappear, if I am in a village and I go to the nether some of my villagers disappear and the villagers act as if they are still because the village does not start to repopulate the only ones that have not disappeared are the ones I have with a tag.
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previously I had already made exchanges with them and some already had them at maximum level, today that I updated the game and entered the nether when leaving 7 of them had disappeared and when I returned to the nether I noticed that some piglins that I had locked up disappeared.

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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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Did you interact with those villagers before entering the Nether?