[Bug Report] Copy Trim gives Invalid Surface on a cylinder

[Quan_Li]

seamless voronoi on a cylinder invalid surface.gh (16.0 KB)

What I did:
I try to make a seamless Voronoi pattern on a cylinder.
I made a repeatable voronoi pattern on a flat surface, then used Copy Trim to copy the pattern to the cylinder.

Bug:
I got an Invalid surface after Copy Trim due to the seam of the cylinder.

I posted this problem before, and @HS_Kim helped me find a solution.
Now I like to report this as a bug. Is this a bug?

Copy Trim gives Invalid Surface

copy trim gives invalid surface.gh (112.1 KB) [image] this is a little bit longer version. [image] I try to morph a planar-trimmed surface onto a cylinder surface. I tried Copy Trim, but it gives an invalid surface. Flow Along Surface gives some mysterious results, basically a seam line. Spoph is… actually I am not sure how to use this component. I like to understand why copy trim failed here. The source surface and the target surface are all good. Thanks!

[Quan_Li]

Let me push this up to top again.

[Quan_Li]

Let me do this again.

[Gears_Gears]

this seams like a problem (I also want to know)