When rendering the following scene, POV-Ray 3.1 shows some unrendered black
circles at the opposite direction of the spotlicht beams in the media.
Is this something known, and is there a workaround for this?

This scene is an altered version of the media2.pov example file:

// Persistence Of Vision raytracer version 3.1 sample file.
//
// Participating media with spotlights.
//

//
// The camera.
//

camera {
  location <0.5, 5, -10>
  right 4/3*x
  up y
  direction z
  angle 65
  look_at <0, 5, 0>
}

//
// Add media. 
//

media {
  intervals 10
  scattering {1, rgb 0.02}
  samples 1, 10
  confidence 0.9999
  variance 1/1000
  ratio 0.9
}

//
// Spotlights pointing at shaft. 
//

#declare Spot = light_source { 
  <0, 0, 0> color rgb<1, 1, 1> * 3
  spotlight
  point_at <0, -1, 0>
  radius 2
  falloff 4
  media_attenuation on
}

#declare Spots = union {
  object { Spot }
  object { Spot rotate <0, 0, 10> rotate <0,   0, 0> }
//  object { Spot rotate <0, 0, 10> rotate <0,  30, 0> }
  object { Spot rotate <0, 0, 10> rotate <0,  60, 0> }
//  object { Spot rotate <0, 0, 10> rotate <0,  90, 0> }
  object { Spot rotate <0, 0, 10> rotate <0, 120, 0> }
//  object { Spot rotate <0, 0, 10> rotate <0, 150, 0> }
  object { Spot rotate <0, 0, 10> rotate <0, 180, 0> }
//  object { Spot rotate <0, 0, 10> rotate <0, 210, 0> }
  object { Spot rotate <0, 0, 10> rotate <0, 240, 0> }
//  object { Spot rotate <0, 0, 10> rotate <0, 270, 0> }
  object { Spot rotate <0, 0, 10> rotate <0, 300, 0> }   
//  object { Spot rotate <0, 0, 10> rotate <0, 330, 0> }
}

object {
  Spots
  rotate <90, 0, 0>
  translate <0, 5, 0>
}

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