Source of command line message:Curves were not co-planar. Projecting to active cplane.?

I’m working on a very large Grasshopper definition and at some point recently I started seeing this message appearing repetitively in the command line.

Does anyone know which Grasshopper components are capable of generating such a message in the Rhino command history?

I have no geometry in the Rhino document, everything is being generated by the Grasshopper definition so I’m assuming that the message must be caused by Grasshopper.

Sounds like a message from surface from planar curves, so I would check that first.

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