It's not a bug. You have just misunderstood how area lights are defined.
  You define two axis vectors as the dimensions of the area light, not its
corner coordinates (as it seems to be the case in your example). What your
example does is (I think) a 1-dimensional area light instead of 2-dimensional.
This is causing the smoothing to be in one direction only.

  What you probably meant was this:

light_source {y*10 rgb 1 area_light <5,0,0> <0,0,5> 16,16 adaptive 1
jitter rotate z*45}

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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