The Curvature continuous extension method can sometimes be a little odd in some cases, like the particular one you show there where it creates a fairly sharper angle than the original.

I didn't really initially pick this behavior myself, it's just how the offset mechanism in the geometry works by default and I've left it that way since it seemed like often times it's a good way to do it.

Here are some other cases where you can see how it can be nice:





- Michael