Hi. I'm trying to get to the bottom of a strange issue with PolyExpand2D. I'm using PolyExpand2D to create a 2D border around an arbitrary curve. Specifically going with PolyExpand2D and not Sweep because Sweep (e.g. Ribbon mode) creates overlapping polygons and other kinds of glitches on sharp corners. PolyExpand2D handles sharp corners miles better but is still not perfect. It creates unshared edge islands in the middle of mesh, please see the screenshot and the attached project.

Is there are way to avoid creating these unshared edge islands or perhaps a method to clean up geometry after PolyExpand2D?

Thanks for any ideas.

fuse seems to fix this problem

Thanks Aizatulin!