SC2Mapster

@vjeux: Go

Just a guess: If you look at the Footprint.xml where the pathing is defined, there are two kinds of pathing information: The Layers/Rows which look like

        <Layers index="Place">
            <Rows value="xx"/>
            <Rows value="xx"/>
        </Layers>

I think this is just for placing buildings but not for unit pathing. I think the Shape-part is responsible for unit-pathing:

        <Shape>
            <Radius value="1.1181"/>
            <Offsets value="-1,0.5;-0.5,1;0.5,1;1,0.5;1,-0.5;0.5,-1;-0.5,-1;-1,-0.5"/>
            <Borders value="7,0,2;0,1,2;1,2,2;2,3,2;3,4,2;4,5,2;5,6,2;6,7,2"/>
        </Shape>

If you connect all the offsets you get something like an octagon (the above Code is from the Pylon Pathing) while the Mineral Pathing is just a rect:

        <Shape>
            <Radius value="1.1181"/>
            <Offsets value="-1,-0.5;-1,0.5;1,0.5;1,-0.5"/>
            <Borders value="3,0,2;0,1,2;1,2,2;2,3,2"/>
        </Shape>

I think this is why units cannot walk between the pylon and the minerals while they can pass between the nexus and the pylon.