Found an edge case that causes a bug

[Habrador]

The outer shape is:
List outerShapePoints = new List();
outerShapePoints.Add(new Vector3(0, 0, 0));
outerShapePoints.Add(new Vector3(0, 0, 1));
outerShapePoints.Add(new Vector3(1, 0, 1));
outerShapePoints.Add(new Vector3(1, 0, 0));

The two inner shapes are:
List shape = new List();
shape.Add(new Vector3(0.2f, 0, 0.2f));
shape.Add(new Vector3(0.2f, 0, 0.8f));
shape.Add(new Vector3(0.4f, 0, 0.8f));
shape.Add(new Vector3(0.4f, 0, 0.2f));
innerShapes.Add(shape);

shape = new List();
shape.Add(new Vector3(0.6f, 0, 0.2f));
shape.Add(new Vector3(0.6f, 0, 0.8f));
shape.Add(new Vector3(0.96f, 0, 0.8f));
shape.Add(new Vector3(0.8f, 0, 0.2f));
innerShapes.Add(shape);

It looks like this:

It will not be able to generate a mesh if you change the third vertex in the second inner shape to something like Vector3(0.98f, 0, 0.8f). It's working fine if you change the third coordinate to new Vector3(0.98f, 0, 0.79999f), so there might be some floating point precision issues going on somewhere?