I did see it in couple of other occasions, after trying older files , builted in V2, related to this last project ( which I do in V3).
In other words, these odd shapes were done all in V2, except this last one.
This is where I tried the odd shapes that I did so far, in both V2 & V3

From what I have seen, V2 did a better, cleaner sweep (without the tweaking of control points), where V3 failed.

Rudy