I can confirm I have also experienced this bug, world (Java Server, running Fabric), was upgraded from 1.21.1 to 1.21.3, upon update all Golems stopped spawning in my farm (I had a player-built, nametagged, Golem around 25-30 blocks from the villagers, said Golem had not been moved since before the update, it had been leashed to a fence post), within seconds of killing said Golem the farm immediately started working again.
I cannot provide a world download but I can link the exact farm design used and relative position of the player made Golem if needed
TNTerabyte
I can confirm I have also experienced this bug, world (Java Server, running Fabric), was upgraded from 1.21.1 to 1.21.3, upon update all Golems stopped spawning in my farm (I had a player-built, nametagged, Golem around 25-30 blocks from the villagers, said Golem had not been moved since before the update, it had been leashed to a fence post), within seconds of killing said Golem the farm immediately started working again.
I cannot provide a world download but I can link the exact farm design used and relative position of the player made Golem if needed