Mackie's moral error theory independently predicts property-cluster failure: if moral properties are metaphysically queer projections, no natural co-occurrence pattern should be expected.

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Co-occurrence pattern(as what should happen with natural properties but wouldn't with projected moral ones): A regular tendency for certain things to happen or exist together—like how 'being metal' and 'conducting electricity' often co-occur in nature.
Mackie: # Mackie J.L. Mackie was a 20th-century British philosopher best known for his work in ethics and the philosophy of religion. He argued that moral values don't actually exist objectively in the world, even though we talk and think about them as if they do—a view called "moral error theory." His ideas challenged traditional beliefs about right and wrong, influencing how philosophers today think about the foundations of morality.
Metaphysically queer(as a description of moral properties): Strange or unusual in terms of what actually exists in the world; referring to something that seems to defy explanation by normal physical or natural means.
Projection (in philosophy)(in methodology and philosophy of interpretation)

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