[Forge 1.15.2] Large Mobs Spawning Inside Blocks

[Ictoan42]

I'm trying to destroy any semblence of balance in my pack, which means adding Iron Golems to the spawn list. While that was relatively easy, due to their large hitbox the spawner places them inside blocks, where the centre block they stand on is air, but other parts of the hitbox are resting on blocks in a wall, allowing them to stand in the air or walk straight through.