Poor output from Make2D into PDF

Anyone know why this horrible thing happened?

Here’s the geometry from which this was created:

d.3dm (138.8 KB)

EDIT: The hole in the line apparently happens because in my original file, this geometry is co-planar with another surface, which apparently affects Make2D even with the “Hidden lines” option checked.

EDIT 2: DWG export is better, but exports iso curves for some ungodly reason.