leveling villagers does not always work and resets the same level so your about to get to lv 3 and all the sudden your 2 again with no experience. has happened at all levels for me sometimes have to level a villager 2 times for every level up to Max 5
happens alot but possibly not every time im not sure seems 100%
it also affected 1.16 and 1.16.1
Thank you for your report!
We're actually already tracking this issue at MCPE-85013, so I will resolve and link this ticket as a duplicate.
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