Your problem originates from incorrect modelling:
You got a polygon that is undercutting another, iow they partially overlap.
Adding meshsmooth on top of it increases the number of polygons and can shift the polygons edges, so that they no longer overlap. But your use of meshsmooth is inappropriate because it doubles the amount of polygons on your model.
You should delete your polygons and recreate them in a different order by using different vertices to form your triangle...
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