I confirm this problem with 'old' villagers trading GUI in this version. I played 1.14.2 a while without any problem with villagers in many villages. As soon as I upgraded to 1.14.3, the problem was obvious only with villagers I already traded with, while the one I didn't trade with before opened their GUI without any difficulty.
I didn't have time to verify if this happens in specific situation (biome, ...).
buhard
I confirm this problem with 'old' villagers trading GUI in this version. I played 1.14.2 a while without any problem with villagers in many villages. As soon as I upgraded to 1.14.3, the problem was obvious only with villagers I already traded with, while the one I didn't trade with before opened their GUI without any difficulty.
I didn't have time to verify if this happens in specific situation (biome, ...).