Retopo bug

Hi. I found a bug in retopo mode. Whenever I'm trying to to extrude vertex it sometimes switches to polygon creation instead and while it registers, produces edges with zero lenght. It also occures with tweak tool.

Can you make a video to show off the bug? I don't know how to reproduce it.

Do you still have the problem?

I'm currently using older nvil version and haven't had time to investigate problem aby further yet. I'll try to check and if issue still persists, record the video for you.