Orientation failure and self-intersections

[stla]

Hello,

I don't know whether you are interested in self-intersecting meshes which still self-intersect after PMP::experimental::remove_self_intersections; here is such a mesh.

And I have a question. If I read this mesh as a polygon soup, then PMP::orient_polygon_soup returns false. However I'm unable to see any orientation problem in this mesh. Does that mean that in spite of the failure of PMP::orient_polygon_soup, the mesh is correctly oriented by luck ? Or is it related to the self-intersections?