Extend surface producing lines

Other people having extend surface producing strange curves ? I did not make any of these curves knowingly

If the surface has high curvature at the edge and you extend a longish way, things can get squirrely - can you post the starting and ending surfaces, I’ll take a look.


Attached is a video with the culprit surface extension. I’ve also attached the test file

TEST.zip (1.6 MB)

I’ve actually experienced this a number of times. This is the first time I’ve reported it because I figured it was a known / common bug for the amount it was happening to me. I’ll post other examples in the future.