I would hazard a guess it is struggling to determine which is the
inside and outside of a bowtie.  The 'path' of a bowtie will include
clockwise and anticlockwise legs, which are usually used to determine
inside and outside e.g. polygons with holes.  Handling both holes and
bowties may be mutually exclusive?  I'd think you need some routine to
normalise the bowtie into a nore conventional polygon, i.e.
determining the "crossover".

A general discussion
http://trac.osgeo.org/geos/wiki/GeometryCleaning

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