Why metallic maps in the Fantasy Kingdom demo has a green channel?

Hi, I am playing around with Unity 6 and the Fantasy Kingdom demo and I noticed that materials have a metallic map with a green channel. In the Unity documentation it says that only the red and alpha channels are used. I think it corresponds to the ambient occlusion, but why would it be since there is already the occlusion map in the inputs of the material.

HDRP uses the green channel for ambient occlusion, maybe it was an HDRP material at one point. In URP it’s not used, as far as I know.

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