Rhino.ExtractIsocurve returning null on trimmed surfaces

I’m working in RhinoScript here as I modified an old script to quickly do something, and I notice a problem or quirk with the ExtractIsocurve method. On a trimmed clyindrical or arc-secton surface–it works fine on untrimmed surfaces–trying to use this method to extract an isocurve along the seam of the closed tube returns null.

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