Issues with 3-axis interpolation

[GeorgS]

Thanks for your replies. today I took the Gcode and imported it into my CAD software. See the pictures attached.
there we can see that compared to a circle, my gcode has a resolution and max. error of 0.01mm.
in Uccnc I have set 0.025mm linear and also corner error, ( for testing even much more, did not help)
so the software should be able to run the code as smooth as with a radius based code..? Unfortunately, it does not.
Of course I could take a radius code in this case, but when it comes to freeform contours or surfaces you often can't describe the shapes in arcs.