Yeah the tips have a problem where the control points backtrack and cause a tiny self-intersecting loop at the end there, these kinds of self-intersection loops cause inconclusive results for operations that need to determine the "inside" region from the "outside" region.

The backtracking control points are very close together, so you need to zoom in quite a ways to see them, then the loop they cause is also even tinier yet than that so a bunch more zooming yet is needed to really see that:







That needs to be repaired by moving that one out of place control point on each tip part, so that those labels that show "2, 1, 3" are in order like "1, 2, 3" instead.

- Michael