I can't create a PathArt with freeform gradient using SDK

Has anyone tried using code to create a new PathArt with a freeform gradient artStyle?
I recently did this but got an unrendered freeform gradient object, though the gradient color stops are visible.
All other paintField properties render correctly except for the freeform gradient.
If I move the color stops with the cursor, the object renders properly; otherwise, it just shows up as white.
However, if I only modify an existing PathArt that already has a freeform gradient using code, everything works fine and the gradient updates instantly to show the changes.
Any thoughts would be appreciated, thanks in advance.