In addition to my previous post:
The problem persists even when I change the sphere-sweep parameters to avoid
scaling. I have noticed an earlier post about "Scale dependant artifacts in
sphere_sweep", but changing the object's size to the values it would become
after scaling and removing the scale parameter won't help:

sphere_sweep {
  linear_spline
  2,
  < 0, -0.15, 0.15>, 0.05
  < 0.2, -0.25, 0>, 0.05
  pigment {Yellow}
  rotate x*-50
  translate -1.5*z+y*0.3
}

// the shadow still has artifacts

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