Program: 97827
Project: 97827
Buggy source:
private void overlayTwo(final SnipeData v){
  final int _brushSize=v.getBrushSize();
  final double _bPow=Math.pow(_brushSize + 0.5,2);
  final int[][] _memory=new int[_brushSize * 2 + 1][_brushSize * 2 + 1];
  for (int _z=_brushSize; _z >= -_brushSize; _z--) {
    for (int _x=_brushSize; _x >= -_brushSize; _x--) {
      for (int _y=this.getBlockPositionY(); _y > 0; _y--) {
        if (_memory[_x + _brushSize][_z + _brushSize] != 1) {
          if ((Math.pow(_x,2) + Math.pow(_z,2)) <= _bPow) {
            if (this.getBlockIdAt(this.getBlockPositionX() + _x,_y - 1,this.getBlockPositionZ() + _z) != 0) {
              if (this.getBlockIdAt(this.getBlockPositionX() + _x,_y + 1,this.getBlockPositionZ() + _z) == 0) {
                if (!this.allBlocks) {
switch (this.getBlockIdAt(this.getBlockPositionX() + _x,_y,this.getBlockPositionZ() + _z)) {
case 1:
case 2:
case 3:
case 12:
case 13:
case 14:
case 15:
case 16:
case 24:
case 48:
case 82:
case 49:
case 78:
                    for (int _d=1; (_d < this.depth + 1); _d++) {
                      this.current.perform(this.clampY(this.getBlockPositionX() + _x,_y + _d,this.getBlockPositionZ() + _z));
                      _memory[_x + _brushSize][_z + _brushSize]=1;
                    }
                  break;
default :
                break;
            }
          }
 else {
            for (int _d=1; (_d < this.depth + 1); _d++) {
              this.current.perform(this.clampY(this.getBlockPositionX() + _x,_y + _d,this.getBlockPositionZ() + _z));
              _memory[_x + _brushSize][_z + _brushSize]=1;
            }
          }
        }
      }
    }
  }
}
}
}
v.storeUndo(this.current.getUndo());
}

Fixed version (ground truth):
private void overlayTwo(final SnipeData v){
  final int _brushSize=v.getBrushSize();
  final double _bPow=Math.pow(_brushSize + 0.5,2);
  final int[][] _memory=new int[_brushSize * 2 + 1][_brushSize * 2 + 1];
  for (int _z=_brushSize; _z >= -_brushSize; _z--) {
    for (int _x=_brushSize; _x >= -_brushSize; _x--) {
      boolean surfaceFound=false;
      for (int _y=this.getBlockPositionY(); _y > 0 && !surfaceFound; _y--) {
        if (_memory[_x + _brushSize][_z + _brushSize] != 1) {
          if ((Math.pow(_x,2) + Math.pow(_z,2)) <= _bPow) {
            if (this.getBlockIdAt(this.getBlockPositionX() + _x,_y - 1,this.getBlockPositionZ() + _z) != 0) {
              if (this.getBlockIdAt(this.getBlockPositionX() + _x,_y + 1,this.getBlockPositionZ() + _z) == 0) {
                if (!this.allBlocks) {
switch (this.getBlockIdAt(this.getBlockPositionX() + _x,_y,this.getBlockPositionZ() + _z)) {
case 1:
case 2:
case 3:
case 12:
case 13:
case 14:
case 15:
case 16:
case 24:
case 48:
case 82:
case 49:
case 78:
                    for (int _d=1; (_d < this.depth + 1); _d++) {
                      this.current.perform(this.clampY(this.getBlockPositionX() + _x,_y + _d,this.getBlockPositionZ() + _z));
                      _memory[_x + _brushSize][_z + _brushSize]=1;
                    }
                  surfaceFound=true;
                break;
default :
              break;
          }
        }
 else {
          for (int _d=1; (_d < this.depth + 1); _d++) {
            this.current.perform(this.clampY(this.getBlockPositionX() + _x,_y + _d,this.getBlockPositionZ() + _z));
            _memory[_x + _brushSize][_z + _brushSize]=1;
          }
          surfaceFound=true;
        }
      }
    }
  }
}
}
}
}
v.storeUndo(this.current.getUndo());
}