In the attached 3dm file, export all the objects to a DWG using the “2004 natural” option. Re-open in Rhino and look at the small black hatches (circle fills), they should be fine, nice and round.
Now, export again, but in the export options UNCHECK the curve tesselation parameters before exporting. Now open the new export file in Rhino and examine the circular hatches. They are very badly faceted… The circles that made the hatches are still fine. IMO this should not be happening…