UnrollSrf : Overlapping surfaces on ChamferEdge geometry (Rhino 9 WIP)

The selected surface was created using ChamferEdge. When I run UnrollSrf on it, the resulting surfaces overlap as shown in the attached image.

I am running Rhino 9 WIP (9.0.25324.6305, 2025-11-20). Is anyone else experiencing this?

Hi thelionmad -

I’m not seeing that in a quick test.

Posting a 3dm file instead of a picture lets us check the same model as the one you are having issues with.
-wim