One thing to watch for is whether the poly is transparent -- if the Flags field in the 0x30 fragment is 2 then the poly is transparent, regardless of whatever texture it might reference (look at the first few routines in OpenZone's frmMainUnit.pas). Usually, though, the transparent polys don't reference actual textures (the 0x30 fragment doesn't actually reference a 0x05 fragment), but maybe they changed that in the new-style zones. Regardless, though, if Flags is 2 then it doesn't matter.
*Every* zone is completely surrounded by transparent polys that prevent players from going outside the zone boundaries. Also, when you're ingame and find that you can't climb a mountain, for instance, rest assured that a transparent poly is in your way (e.g. Butcherblock Mountains). When you add zone bounds in OpenZone, the result is the same -- OpenZone creates transparent polygons for every zone bound line you add, and it automatically surrounds a zone with a bounding box of transparent polys.
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