Polygon-polyline intersection oddity

[micycle1]

This is a question about expected output in Clipper2.

I noticed a discrepancy between Clipper2 output and the output of another Geometry software, both shown below.

Below, I am clipping (intersecting) a polyline with a heart-shaped polygon.

Clipper2's output includes fragments of the polygon's perimeter, which are joined to parts of the line. In my mind, this shouldn't be the case. Wanted to get your thoughts on this.

JTS (expected?)

Clipper2

[micycle1]

I've managed to get the intended output with Clipper by using the Clipper64 object directly, adding the polyline as an OpenSubject and executing with a solutionOpen Paths64 object into which the correct output is written.