often I run in the situation that I add knot to a curve and the curve looks kinky. Than I create a new curve based on the control points of the kinky curve and than I got what I want - I can move the new curve control points and the curve stays smooth. So, finally I have two different curves with the same control points - one smooth and one with a kind of kink. Why is the curve with added knot not smooth? How to avoid the “kink” behavoir?
Here I moved the same control point of both curves to better show the difference