Program: 130670
Project: 130670
Buggy source:
@Override public void populate(IChunkProvider par1IChunkProvider,int par2,int par3){
  int var4=par2 * 16;
  int var5=par3 * 16;
  BiomeGenBase var6=this.worldObj.getBiomeGenForCoords(var4 + 16,var5 + 16);
  this.rand.setSeed(this.worldObj.getSeed());
  long var7=this.rand.nextLong() / 2L * 2L + 1L;
  long var9=this.rand.nextLong() / 2L * 2L + 1L;
  this.rand.setSeed((long)par2 * var7 + (long)par3 * var9 ^ this.worldObj.getSeed());
  boolean var11=false;
  int var12;
  int var13;
  int var14;
  MinecraftForge.EVENT_BUS.post(new PopulateChunkEvent.Post(par1IChunkProvider,worldObj,rand,par2,par3,var11));
  BlockSand.fallInstantly=false;
}

Fixed version (ground truth):
@Override public void populate(IChunkProvider par1IChunkProvider,int par2,int par3){
  int var4=par2 * 16;
  int var5=par3 * 16;
  BiomeGenBase var6=this.worldObj.getBiomeGenForCoords(var4 + 16,var5 + 16);
  this.rand.setSeed(this.worldObj.getSeed());
  long var7=this.rand.nextLong() / 2L * 2L + 1L;
  long var9=this.rand.nextLong() / 2L * 2L + 1L;
  this.rand.setSeed((long)par2 * var7 + (long)par3 * var9 ^ this.worldObj.getSeed());
  boolean var11=false;
  int var12;
  int var13;
  int var14;
  if (this.rand.nextInt(16) == 0) {
    var12=var4 + this.rand.nextInt(16) + 8;
    var13=16 - this.rand.nextInt(2);
    var14=var5 + this.rand.nextInt(16) + 8;
  }
  for (int i=0; i < 2; i++) {
    var12=16;
    var13=16;
    var14=16;
    (grassClusters).generate(this.worldObj,this.rand,var12,var13,var14);
  }
  for (int i=0; i < 1; i++) {
    var12=var4 + this.rand.nextInt(16) + 8;
    var13=rand.nextInt(256);
    var14=var5 + this.rand.nextInt(16) + 8;
    (firecrystals).generate(this.worldObj,this.rand,var12,var13,var14);
  }
  if (this.rand.nextInt(32) == 0) {
    var12=var4 + this.rand.nextInt(16) + 8;
    var13=17;
    var14=var5 + this.rand.nextInt(16) + 8;
    while (this.worldObj.isAirBlock(var12,var13,var14))     var13--;
    infusion.generate(this.worldObj,this.rand,var12,var13,var14);
  }
  if (this.rand.nextInt(32) == 0) {
    var12=var4 + this.rand.nextInt(16);
    var13=17 - this.rand.nextInt(2);
    var14=var5 + this.rand.nextInt(16);
    (this.items.get(this.rand.nextInt(7))).generate(this.worldObj,this.rand,var12,var13,var14);
  }
  if (this.rand.nextInt(2) == 0) {
    var12=var4 + this.rand.nextInt(16) + 8;
    var13=17;
    var14=var5 + this.rand.nextInt(16) + 8;
  }
  if (this.rand.nextInt(500) == 0) {
    var12=var4 + this.rand.nextInt(16) + 8;
    var13=40;
    var14=var5 + this.rand.nextInt(16) + 8;
  }
  for (int i=0; i < 1; i++) {
    var12=var4 + this.rand.nextInt(16) + 8;
    var13=17;
    var14=var5 + this.rand.nextInt(16) + 8;
  }
  if (this.rand.nextInt(250) == 0) {
    var12=var4 + this.rand.nextInt(16) + 8;
    var13=17;
    var14=var5 + this.rand.nextInt(16) + 8;
    (crypts.get(this.rand.nextInt(2))).generate(this.worldObj,this.rand,var12,var13,var14);
  }
  if (this.rand.nextInt(250) == 0) {
    var12=var4 + this.rand.nextInt(16) + 8;
    var13=17;
    var14=var5 + this.rand.nextInt(16) + 8;
    (l1Trees.get(this.rand.nextInt(2))).generate(this.worldObj,this.rand,var12,var13,var14);
  }
  MinecraftForge.EVENT_BUS.post(new PopulateChunkEvent.Post(par1IChunkProvider,worldObj,rand,par2,par3,var11));
  BlockSand.fallInstantly=false;
}