I created a golem farm, which you can see in the attached screen shots. Golems sometimes spawn in the middle of a glass area.
They should suffocate but they stay alive in their spawning area. They seem to be trapped and can't walk or even get out.
This affects my iron farm as villagers feel the presence of this golem and don't spawn any other.
As I understood from the issue MC-3927, iron golems can spawn both in half slabs and glass. Thanks for the info though I would still be happy if this was fixed. Since then, I will change the glass blocks for other type. Thanks again.