Program: 30480
Project: 30480
Buggy source:
public boolean spawnMeteorite(final IMeteoriteWorld w,final int x,final int y,final int z){
  if (!w.hasSkyLight()) {
    return false;
  }
  Block blk=w.getBlock(x,y,z);
  if (!this.validSpawn.contains(blk)) {
    return false;
  }
  this.settings=new NBTTagCompound();
  this.settings.setInteger("String_Node_Str",x);
  this.settings.setInteger("String_Node_Str",y);
  this.settings.setInteger("String_Node_Str",z);
  this.settings.setInteger("String_Node_Str",Block.getIdFromBlock(blk));
  this.settings.setDouble("String_Node_Str",this.meteoriteSize);
  this.settings.setDouble("String_Node_Str",this.realCrater);
  this.settings.setDouble("String_Node_Str",this.squaredMeteoriteSize);
  this.settings.setDouble("String_Node_Str",this.crater);
  this.settings.setBoolean("String_Node_Str",Math.random() > 0.9);
  if (blk == Blocks.SAND) {
    this.type=new FalloutSand(w,x,y,z,this.putter,this.skyStoneDefinition);
  }
 else   if (blk == Blocks.HARDENED_CLAY) {
    this.type=new FalloutCopy(w,x,y,z,this.putter,this.skyStoneDefinition);
  }
 else   if (blk == Blocks.ICE || blk == Blocks.SNOW) {
    this.type=new FalloutSnow(w,x,y,z,this.putter,this.skyStoneDefinition);
  }
  int realValidBlocks=0;
  for (int i=x - 6; i < x + 6; i++) {
    for (int j=y - 6; j < y + 6; j++) {
      for (int k=z - 6; k < z + 6; k++) {
        blk=w.getBlock(i,j,k);
        if (this.validSpawn.contains(blk)) {
          realValidBlocks++;
        }
      }
    }
  }
  int validBlocks=0;
  for (int i=x - 15; i < x + 15; i++) {
    for (int j=y - 15; j < y + 15; j++) {
      for (int k=z - 15; k < z + 15; k++) {
        blk=w.getBlock(i,j,k);
        if (this.invalidSpawn.contains(blk)) {
          return false;
        }
        if (this.validSpawn.contains(blk)) {
          validBlocks++;
        }
      }
    }
  }
  final int minBlocks=200;
  if (validBlocks > minBlocks && realValidBlocks > 80) {
    int skyMode=0;
    for (int i=x - 15; i < x + 15; i++) {
      for (int j=y - 15; j < y + 11; j++) {
        for (int k=z - 15; k < z + 15; k++) {
          if (w.canBlockSeeTheSky(i,j,k)) {
            skyMode++;
          }
        }
      }
    }
    boolean solid=true;
    for (int j=y - 15; j < y - 1; j++) {
      if (w.getBlock(x,j,z) == Platform.AIR_BLOCK) {
        solid=false;
      }
    }
    if (!solid) {
      skyMode=0;
    }
    if (skyMode > 10) {
      this.placeCrater(w,x,y,z);
    }
    this.placeMeteorite(w,x,y,z);
    if (skyMode > 3) {
      this.decay(w,x,y,z);
    }
    this.settings.setInteger("String_Node_Str",skyMode);
    w.done();
    WorldData.instance().spawnData().addNearByMeteorites(w.getWorld().provider.getDimension(),x >> 4,z >> 4,this.settings);
    return true;
  }
  return false;
}

Fixed version (ground truth):
public boolean spawnMeteorite(final IMeteoriteWorld w,final int x,final int y,final int z){
  if (!w.isNether()) {
    return false;
  }
  Block blk=w.getBlock(x,y,z);
  if (!this.validSpawn.contains(blk)) {
    return false;
  }
  this.settings=new NBTTagCompound();
  this.settings.setInteger("String_Node_Str",x);
  this.settings.setInteger("String_Node_Str",y);
  this.settings.setInteger("String_Node_Str",z);
  this.settings.setInteger("String_Node_Str",Block.getIdFromBlock(blk));
  this.settings.setDouble("String_Node_Str",this.meteoriteSize);
  this.settings.setDouble("String_Node_Str",this.realCrater);
  this.settings.setDouble("String_Node_Str",this.squaredMeteoriteSize);
  this.settings.setDouble("String_Node_Str",this.crater);
  this.settings.setBoolean("String_Node_Str",Math.random() > 0.9);
  if (blk == Blocks.SAND) {
    this.type=new FalloutSand(w,x,y,z,this.putter,this.skyStoneDefinition);
  }
 else   if (blk == Blocks.HARDENED_CLAY) {
    this.type=new FalloutCopy(w,x,y,z,this.putter,this.skyStoneDefinition);
  }
 else   if (blk == Blocks.ICE || blk == Blocks.SNOW) {
    this.type=new FalloutSnow(w,x,y,z,this.putter,this.skyStoneDefinition);
  }
  int realValidBlocks=0;
  for (int i=x - 6; i < x + 6; i++) {
    for (int j=y - 6; j < y + 6; j++) {
      for (int k=z - 6; k < z + 6; k++) {
        blk=w.getBlock(i,j,k);
        if (this.validSpawn.contains(blk)) {
          realValidBlocks++;
        }
      }
    }
  }
  int validBlocks=0;
  for (int i=x - 15; i < x + 15; i++) {
    for (int j=y - 15; j < y + 15; j++) {
      for (int k=z - 15; k < z + 15; k++) {
        blk=w.getBlock(i,j,k);
        if (this.invalidSpawn.contains(blk)) {
          return false;
        }
        if (this.validSpawn.contains(blk)) {
          validBlocks++;
        }
      }
    }
  }
  final int minBlocks=200;
  if (validBlocks > minBlocks && realValidBlocks > 80) {
    int skyMode=0;
    for (int i=x - 15; i < x + 15; i++) {
      for (int j=y - 15; j < y + 11; j++) {
        for (int k=z - 15; k < z + 15; k++) {
          if (w.canBlockSeeTheSky(i,j,k)) {
            skyMode++;
          }
        }
      }
    }
    boolean solid=true;
    for (int j=y - 15; j < y - 1; j++) {
      if (w.getBlock(x,j,z) == Platform.AIR_BLOCK) {
        solid=false;
      }
    }
    if (!solid) {
      skyMode=0;
    }
    if (skyMode > 10) {
      this.placeCrater(w,x,y,z);
    }
    this.placeMeteorite(w,x,y,z);
    if (skyMode > 3) {
      this.decay(w,x,y,z);
    }
    this.settings.setInteger("String_Node_Str",skyMode);
    w.done();
    WorldData.instance().spawnData().addNearByMeteorites(w.getWorld().provider.getDimension(),x >> 4,z >> 4,this.settings);
    return true;
  }
  return false;
}