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Note, this is a slightly strange use case. I am using both inner layers for GND polygons, and they do not have any traces on them. They are simply being used to help sink heat.
It seems that the "hasFourLayers()" function is not catching them, due to the fact that my inner layers do not have traces.
For a quick fix, I added some "dummy" traces (actually just wires drawn on the inner layer with net names that don't cause air-wires).
This totally works, but I thought I'd throw this up here, just in case someone else runs into it, and maybe might have a more creative way to solve this - on the ULP end.
For reference, this is what I did with my inner GND layers (They have the text objects "2" and "3" in this screenshot):
