Issues with 2018.3.0f2

[_Aka_]

Yes i am using the version 2018.3.0f2

Sorry, I meant what Curvy version do you use.

I tried reproducing it with your steps, but still couldn't. Maybe it's the "Try to manipulate a bit the mesh for the mesh cap" part that I got wrong. What do you mean exactly by manipulating the mesh?

And when you save a scene with the error happening on it, does it stay after you reload the scene? or do you need to do the steps from the start to reproduce the bug again?