When I trade with a villager (specifically a cartographer, specifically if I trade compasses) they sometimes become unresponsive after I exit. I cannot right-click to trade again, nor can I punch or kill them.

When I exit the world and enter again it works again. It happened three times. I couldn't reproduce it a fourth time yet, so I don't know whether other entities remain interactive or are affected as well.

Edit: Seems like it was just lag. When it happened again I went to test another entity (punching a sheep), it first didn't respond, then the GUIs of the villagers quickly flashed on the screen and the sheep got hurt.