Mesh_3 manifold not respected

Using ring_H1H2.off, ringH2H3.off, ring_H3H4.off if we use                                           `facet_topology(CGAL::FACET_VERTICES_ON_SAME_SURFACE_PATCH)` and `CGAL::parameters::manifold()`, we have non-manifold issues (some tetra in the holes). If we switch to `facet_topology(CGAL::FACET_VERTICES_ON_SAME_SURFACE_PATCH_WITH_ADJACENCY_CHECK)`, they disappear.
