I have the following sphere:

 sphere
 { 0,1 pigment { rgbt 1 } hollow
   interior
   { media
     { scattering { 3, <.3,.1,.1> }
       density
       { spherical density_map
         { [0 rgb 0]
           [.5 rgb .2]
           [1 rgb .5]
         }
       }
     }
  }
  scale 1.1
 }

if I use no background and render using +fn32 no media effect is visible.
Doesn't happen when I use a black background. Is there any way to solve this?

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