I was curing zombie villagers while I was building an island and after curing 5 of them one of them became "frozen"... I tried to move it with water, dig under it, hit it, and even put it in lava but the villager took no damage and didn't move...  Zombies wouldn't target it, however skeletons could still hit it if I made it.. It took an admin on server to come in and kill it in creative for it to die... Forgot to add after curing it, it kept its job when there was no job block in any distance whatsoever... when I tried to place a job block it wouldn't target it either or produce any particles. Other people I play with have had an issue every now and then...