It dosent work right due to the servers multiplayer lag slowing your clock, the entity limit of spawned creatures per person and the tick count of entity spawns being slower due to the lag that the server invokes. It works perfectly on a single player world because theres nothing holding back all the various counters needed to spawn in an iron golem at a village- the same cant be said for Multiplayer, unfortunatly.

10 people on, it probably runs fine- 11 people on, now it goes to hell XD
30 people on? no bloody chance of those numbers