Project Curve on Surface Wrong

In the attached picture there is an axample of Project wrong
Ciao Vittorio

The picture doesn’t help us. Can you post your geometry? Thanks!

It is not hard to duplicate what is shown in the picture.

BadProject.3dm (48.8 KB)

fwiw, it works properly if you explode the square first…
seems like a bug though.

Hi Vittorio- added as