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e95d19b560
in t/perimeters.t, see the comment FIXME skip the 1st layer in the test 'loops start on concave point if any' The failure is due to the seam smoothing, which brings the seam too far away from the external perimeter at the 1st layer, which uses significantly wider extrusion rate than the other layers. Moving the seam point from the external perimeter causes an error when projecting the seam point back to the external perimeter, where the projection lands not exactly at a corner point, creating a short segment at the end of a polygon loop.