GHpyhton joincurves AutoBake to Rhino

I’m a new guy for ghpython.

When you text or run the script,the rs.joincurves always bake to the Rhino
that a little annoy problem, and I can’t figure out how to solve it.

that’s my example file,and thanks for your helping.

GHpython joinCurveproblem.3dm (30.3 KB)
GHpython (4.4 KB)

I also have this problem, i don’t it is why?