I just updated to Minecraft 1.14.3 (just came out yesterday) and I went to go trade with some villagers. Some of them had no issues whatsoever, but others had what I presume to be a bug. With certain villagers (nothing special about them, just typical professions (mostly different) and different trading levels) I experienced an issue in which I would click on a villager to trade and the UI would pop up for half a second and then go away. I was unable to use the trading UI because of this. What was even stranger was at first it was just a few villagers, but now one of the villagers (a cleric) who didn't have this issue just started to have it (Note that I had just come back from the Nether when this new issue appeared on the Cleric). Anyway, I have no idea what's going on, please let me know if this is something that you have seen or experienced.