Villagers will randomly change trades or change offers after they've been traded with and upgraded to level 2, 3, or 4. Their trade and offers should be locked. This only seems to affect villagers that have been bred in 1.16 and are more than 2-3 blocks way from their occupation block and in a minecart.
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're resolving and linking this ticket forward as a duplicate of MCPE-115000, as that ticket contains more detailed information and/or has already been triaged by Mojang.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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