Iron golems spawn in air blocks

As proof of this bug, I removed the spawn pads on a 96 village Iron Casster iron farm (I used this large-scale farm so many golems spawned in quick succession) so that the golem spawn area was completely air, with no solid blocks. The golems spawned mid-air! I have attached a video of this experiment.

This bug may have been introduced with the fix of MC-130270 Golems were spawning inside blocks.

In response Tyler Hunting's statement "...iron golems spawn in unintended places...", I built a farm with a ring of doors 32 x 32 square and watched golems spawn outside the doors.

According to the Wiki, "Iron golems will spawn in a 16×6×16 area, centered vertically and horizontally between the bases of the 21 or more valid doors in a village if it has at least 10 villagers."

The 16×6×16 area statement is completely wrong and has been for the last few versions. It would be helpful if the wiki could be updated after this bug is fixed.

Iron Golems seem to be having many spawning bugs in this update! Another one just came up where they can no longer spawn within half-slabs MC-135128.

Golems now check for a solid block below them and air block at head level and above

Yay, you've saved iron farms yet again, thank you!