No Villagers

So basically I have no villagers in my SMP world. I mean the villages have no villagers. I went to a couple of villages and none of them have villagers. The doors are there, even the golems, just no villagers. I then OP myself, made the world creative and tried using villager eggs but something strange happened. The villagers appear for a second, make their weird noise and then disappear. Also the trader is not there though the llamas are there. I really need a iron farm so please help..

Thank you

I use Java 1.14.4

No plugins and all just vanilla Minecraft

Ok I Fixed it you can close the thread.

The NPC thing didn't work at the start but now it seems to work. I mean it was already on but I offed it and tried again it worked.

Thanks Mc88Donalds and Roman.