Iron golems can spawn in spaces less than three blocks high and get stuck

The Iron golems spawning from villagers can put them in a 2 1/2 block high space. This causes them to be stuck and not move from that location. While running a playthrough, I have a sandstone half slab on the 3rd block high creating a 2 1/2 block walk space below. I am having numerous golems spawning in this area and the only way to release them is to break the blocks.