Program: 145711
Project: 145711
Buggy source:
public void breakBlock(World world,int x,int y,int z,Block block,int p_149749_6_){
  TileEntityAdvancedDispensers tileEntityAdvancedDispensers=(TileEntityAdvancedDispensers)world.getTileEntity(x,y,z);
  if (tileEntityAdvancedDispensers != null) {
    for (int i1=0; i1 < tileEntityAdvancedDispensers.getSizeInventory(); ++i1) {
      ItemStack itemstack=tileEntityAdvancedDispensers.getStackInSlot(i1);
      if (itemstack != null) {
        float f=this.rand.nextFloat() * 0.8F + 0.1F;
        float f1=this.rand.nextFloat() * 0.8F + 0.1F;
        EntityItem entityitem;
        for (float f2=this.rand.nextFloat() * 0.8F + 0.1F; itemstack.stackSize > 0; world.spawnEntityInWorld(entityitem)) {
          int j1=this.rand.nextInt(21) + 10;
          if (j1 > itemstack.stackSize) {
            j1=itemstack.stackSize;
          }
          itemstack.stackSize-=j1;
          entityitem=new EntityItem(world,(double)((float)x + f),(double)((float)y + f1),(double)((float)z + f2),new ItemStack(itemstack.getItem(),j1,itemstack.getItemDamage()));
          float f3=0.05F;
          entityitem.motionX=(double)((float)this.rand.nextGaussian() * f3);
          entityitem.motionY=(double)((float)this.rand.nextGaussian() * f3 + 0.2F);
          entityitem.motionZ=(double)((float)this.rand.nextGaussian() * f3);
          if (itemstack.hasTagCompound()) {
            entityitem.getEntityItem().setTagCompound((NBTTagCompound)itemstack.getTagCompound().copy());
          }
        }
      }
    }
    world.func_147453_f(x,y,z,block);
  }
  super.breakBlock(world,x,y,z,block,p_149749_6_);
}

Fixed version (ground truth):
@Override public void breakBlock(World world,int x,int y,int z,Block block,int p_149749_6_){
  TileEntityAdvancedDispensers tileEntityAdvancedDispensers=(TileEntityAdvancedDispensers)world.getTileEntity(x,y,z);
  if (tileEntityAdvancedDispensers != null) {
    for (int i1=0; i1 < tileEntityAdvancedDispensers.getSizeInventory(); ++i1) {
      ItemStack itemstack=tileEntityAdvancedDispensers.getStackInSlot(i1);
      if (itemstack != null) {
        float f=this.rand.nextFloat() * 0.8F + 0.1F;
        float f1=this.rand.nextFloat() * 0.8F + 0.1F;
        EntityItem entityitem;
        for (float f2=this.rand.nextFloat() * 0.8F + 0.1F; itemstack.stackSize > 0; world.spawnEntityInWorld(entityitem)) {
          int j1=this.rand.nextInt(21) + 10;
          if (j1 > itemstack.stackSize) {
            j1=itemstack.stackSize;
          }
          itemstack.stackSize-=j1;
          entityitem=new EntityItem(world,(double)((float)x + f),(double)((float)y + f1),(double)((float)z + f2),new ItemStack(itemstack.getItem(),j1,itemstack.getItemDamage()));
          float f3=0.05F;
          entityitem.motionX=(double)((float)this.rand.nextGaussian() * f3);
          entityitem.motionY=(double)((float)this.rand.nextGaussian() * f3 + 0.2F);
          entityitem.motionZ=(double)((float)this.rand.nextGaussian() * f3);
          if (itemstack.hasTagCompound()) {
            entityitem.getEntityItem().setTagCompound((NBTTagCompound)itemstack.getTagCompound().copy());
          }
        }
      }
    }
    world.func_147453_f(x,y,z,block);
  }
  super.breakBlock(world,x,y,z,block,p_149749_6_);
}