To my knowledge, iron golems spawn only on certain block types, excluding e.g. lower slabs and workstations. See attached picture of iron golem spawned on top of flethcer workstation and another iron golem spawned on wooden lower slab. Cats spawn on lower slab too.
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Iron golems can spawn inside of most non-full blocks, as only as there is a solid block underneath. However, this has been reported as a bug and is tracked at MCPE-56833.
Iron golems can spawn inside of most non-full blocks, as only as there is a solid block underneath. However, this has been reported as a bug and is tracked at MCPE-56833.