GH bakes solids with reversed normals

Back from this thread where I had some boolean trouble, but realized I had baked solids with reversed normals.

Here is the definition that produced them, with internalized input.
This definition takes lines and planar polylines as system lines to make a frame based on any section.
The problem seems to arise only with solids produced by the "Extrude Along (curve) component.
Strangely, Rhino doesn’t detect them as bad objects, and if exploded and joined, are not correctly flipped by Rhino.

Produces closed solids with reversed normals.gh (31.4 KB)