POV 3.5 b 7 on PII 233 128 MB with NT 4 Sp 6

I had such syntax within isosurface:

  max_gradient 10
  evaluate 1, 10, 0.99

but renderer said after trace

  Warning: The maximum gradient found was 184.775, but max_gradient of
  the isosurface was set to 1988.679. Adjust max_gradient to
  get a faster rendering of the isosurface.

IMO 1988.679 <> 10. Expected behaviour, misunderstand or bug ?

ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)|_((x+y)*.7,z,.1)|_((x+y+2)*.7,z,.1)|_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35

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