I built an iron farm which works as intended, however, there is one issue that occurs periodically. I have a 2.3125 high x 2 wide x 6 block long space where my villagers are but approximately 1 out of every 50 golem spawns actually occurred in this space the floor of this space is bottom slabs and clearly not tall enough to meet the iron golem spawning requirements.

not sure if anyone else has ever come across this problem. i haven't heard of it being an issue before