Any CadLwPolyline with a coordinate of 0,0 ignores that point as valid coordinate. You can use the following example from another post to view the issue. This will render a triangle rather than a rectangle.
using (Cad…...ColorId = 1; // index of color: AutoCAD Color Index RGB Equivalents...the blue box has a #7099C64C color. image.png (148.9 KB) oleksii...