does show up when selected though
If you didn’t notice it is missing in more then one view. It was one single line piped. with a larger circumference and a smaller circumference for the second choice
I did the same thing in Rhino WIP and it didn’t misbehave. It rendered correctly as well.
N/M tangent seams was turned off. not sure why that would effect 1 line
I think that that curve is the surface seam.
New to this thanks for helping discover why.