The edge built from a closed path that nothing cuts started at the anchor the
planar map gave it, so dashes, a width profile or a brush began at a different
place than on the path. The edge now starts at the anchor where its path
starts. An edge with no anchor there takes its dashes from its own start and
leaves off the profile and brush.
The command description and the progress doc say that dashes aligned to
corners and path ends are not fitted to cut edges.