Iron Golems do not spawn in the new world levels 266+ during the day
If you build an iron farm above 266+ then during the day golems do not spawn
they do however spawn fine at night
this is a repeatable bug I have duplicated across multiple worlds
I have attached a screenshot of the iron farm I am using
Should note the farm I am also testing with is 8 blocks from the world build limit of 320 currently, so the base is at 312 and the top of the farm is 320