Why is this Invalid Curve?

@bdidier wrote:

Hello

I have a problem with planar Rhino curve: when I assign it to a Curve parameter in Grasshopper, it is reported as: Invalid curve.
This is the curve:

This is what I get in Grasshopper:

If I rebuild it in Rhino or Grasshopper then everything is okay.
But can someone please explain to me why is this Rhino curve an Invalid curve?

Thank you very much !
Invalid Curve.3dm (37.6 KB)
Invalid Curve.gh (9.8 KB)

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