I tried building a iron golem farm and noticed the golems were not spawning as intended for the [1.14.3 farm build|https://www.youtube.com/watch?v=POTL0MiYqDc].

So i went ahead and did some testing to see if this was an spigot issue, i tried using a iron golem spawner and that didn't spawn any, I also tried killing a naturally spawning iron golem in a village to see if it would respawn some time later and it didn't.

I downloaded the exact same world folder from the server and played through single player and it did spawn the iron golems and the iron golem in the town respawned.

The way it works in a breif scuffed rundown is the villagers have to have slept and worked within 30mins to be able to spawn iron golems, when the villager is scared by the zombie in the middle through line of sight, they should activate a chance of an iron golem spawning within a certain radius of itself on an spawnable block. The villagers are in water so they are constantly jumping up and down in and out of line of sight of the zombie so they're constantly go in a state of working/sleeping and scared. They also check every 10seconds whether there is a iron golem in their radius if not they try to spawn one, so you drop them off the edge out of their detection radius.

Any other questions that you're confused about feel free to ask   

Just realized in screenshot i was 3 versions behind i updated and tested, still having same issue

iron golem spawn test world: https://megaupload.nz/rcP8Tdyand/For_md_5_rar