pov renders strange black artifacts when using a spotlight falloff 90 with
media

the scene gives correct results if no media is used with the falloff 90
it also gives correct image if we keep the media and the falloff is no 90

pov3.5b6 win2000 Athlon 900MHz 256MB


light_source
{
  <0,25,5>
  color rgb 1
  spotlight radius 10 falloff 90 point_at <0,0,0>

  media_interaction on
}

camera
{
  location  <0, 0,-5>
  direction z up y right x look_at <0,0,0>
}

sphere
{
  0,1
  hollow
  pigment { color rgb <1,1,1,0.85> }
  finish { diffuse 1 ambient 0 }
  interior
  {
    media {  scattering { 1, rgb <.83,.79,.75>*2 extinction 1/2 }
        samples 10
        method 3
          }
  }
}

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