The bug
When you create an iron golem, snow golem, or wither, it doesn't matter which direction the head(s) you place are facing: the mobs will always spawn facing south.
By following this logic, building the pattern sideways or upside-down should also spawn them in these orientations. I'm obviously not asking for that; I'm saying that at least the directions you place the heads could be respected.
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But shouldn't this be reviewed? It never came to a developer and maybe it's not intended. I know south is the default rotation for everything as it is the "front", and there's a lot of bugs related to that. But isn't there a chance that this specific one could be an unintended feature?
Edit: WAI per MC-8948.