POV 3.5b4 on PII233 128 MB with NT4Sp6

it looks like select inside select not work

look at the function

#local test=function{
        select(
          f_noise3d(floor(x),floor(y),0)-(1/3),
          0,
          select(
            f_noise3d(floor(y),floor(x),0)-(1/2),
            1,
            2
          )
        )
      }

in my opionion it should evenly return 0, 1 and 2

but I have tested this 100.000 with differents seeds and random points
with script from the end of this post and it returned

0 - 0 times
1 - 64161 times
2 - 35839 times

anybody can confirm ?
here is script:

#local Count0=0;
#local Count1=0;
#local Count2=0;
#local MaxSeed=1000;
#local MinRand=-1000;
#local MaxRand=1000;
#local Loops=100;
#local CounterSeed=0;
#while(CounterSeed<MaxSeed)
  #local Seed=seed(CounterSeed);
  #local Counter=0;
  #while (Counter<Loops)
    #switch(test(
        Interpolate(rand(Seed),0,1,MinRand,MaxRand,0),
        Interpolate(rand(Seed),0,1,MinRand,MaxRand,0),
        0))
      #case(0)
        #local Count0=Count0+1;
        #break
      #case(1)
        #local Count1=Count1+1;
        #break
      #case(2)
        #local Count2=Count2+1;
        #break
      #else
        #error "unexpected"
    #end
    #local Counter=Counter+1;
  #end
  #local CounterSeed=CounterSeed+1;
#end

ABX

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