Turn the GD zone upside down. you should see solid red polygons along the riverbed
NOTE: what the tool is NOT showing are bounding polygons. These are polygons that define where you cannot go, and generally surround the navigable area of the zone on all six sides. I choose not to display them because then you would not be able to see anything. But they DO exist, and their color/texture attribute is 00000000h. They also serve to limit certain areas. They are the reason why you can't climb over the really high areas in Butcherblock, for example; you collide with those "invisible" polygons. If, for instance, you export as a DXF and import the DXF into any other 3D tool, you can then see the bounding polygons.
Windcatcher
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