I would:
1. Delete any two point polys if they exist.
2.Check for any polys with >4 points and split or delete them.
3.Check for and weld any points that aren't welded and need to be around the problem polygon.
4. Turn on double sided in surface editor.
Hope that fixes any problem you might be having.
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If the world that we are forced to accept is false and nothing is true, then everything is possible.
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