Minecraft 1.18.1
Fabric Carpet 1.18-1.4.56

When iron golem detection and hostile detection (zombie) are turned on, golems spawn regularly, so the simple setup I have seems to be working, but there aren't any sight lines drawn between the villagers and zombie. During the night, villagers occasionally lay in their beds but quickly get up due to the nearby zombie, so I'd imagine they can see it and identify it as a threat. I also have update frequency set to 1. I am probably missing something...