I was in my village leveling up my villagers when multiple of my villagers did not level up even though In filled up their experience bars. This is a very annoying bug, and it almost makes villagers unusable. The only way to get around this issue was to trader the same trade I just traded, and it would sometimes be fixed.
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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