Program: 20054
Project: 20054
Buggy source:
public void suck(){
  HashSet<UUID> sucked=new HashSet<UUID>();
  for (  SCLItem item : list.values()) {
    if (!item.isLocationDeferred()) {
      Block block=item.getLocation().getBlock();
      Chunk chunk=block.getChunk();
      if (chunk.isLoaded() && plugin.canSuck.contains(block.getType())) {
        if (block.getState() instanceof InventoryHolder) {
          InventoryHolder container=(InventoryHolder)block.getState();
          Inventory inventory=container.getInventory();
          if (inventory.firstEmpty() != -1) {
            ArrayList<Entity> entityList=new ArrayList<Entity>();
            for (            Chunk inChunk : getNearbyChunks(block,plugin.cfg.suckRange())) {
              for (              Entity entity : inChunk.getEntities()) {
                if (entity instanceof Item && entity.getLocation().distance(block.getLocation()) <= plugin.cfg.suckRange()) {
                  entityList.add(entity);
                }
              }
            }
            for (            Entity entity : entityList) {
              ItemStack original=((Item)entity).getItemStack();
              ItemStack itemFound=original.clone();
              if (inventory.firstEmpty() != -1 && !sucked.contains(entity.getUniqueId())) {
                if (entity.getTicksLived() >= plugin.cfg.suckInterval()) {
                  inventory.addItem(itemFound);
                  entity.remove();
                  if (plugin.cfg.suckEffect()) {
                    item.getLocation().getWorld().playEffect(item.getLocation(),Effect.CLICK2,0);
                  }
                }
                sucked.add(entity.getUniqueId());
              }
 else {
                break;
              }
            }
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
public void suck(){
  HashSet<UUID> sucked=new HashSet<UUID>();
  for (  SCLItem item : list.values()) {
    if (!item.isLocationDeferred()) {
      Block block=item.getLocation().getBlock();
      Chunk chunk=block.getChunk();
      if (chunk.isLoaded() && plugin.canSuck.contains(block.getType())) {
        if (block.getState() instanceof InventoryHolder) {
          InventoryHolder container=(InventoryHolder)block.getState();
          Inventory inventory=container.getInventory();
          if (inventory.firstEmpty() != -1) {
            ArrayList<Entity> entityList=new ArrayList<Entity>();
            for (            Chunk inChunk : getNearbyChunks(block,plugin.cfg.suckRange())) {
              for (              Entity entity : inChunk.getEntities()) {
                if (entity instanceof Item && entity.getLocation().distance(block.getLocation()) <= plugin.cfg.suckRange()) {
                  entityList.add(entity);
                }
              }
            }
            for (            Entity entity : entityList) {
              if (entity instanceof Item) {
                Item pickup=(Item)entity;
                pickup.setPickupDelay(plugin.cfg.suckInterval());
                ItemStack original=pickup.getItemStack();
                ItemStack itemFound=original.clone();
                if (inventory.firstEmpty() != -1 && !sucked.contains(entity.getUniqueId())) {
                  if (entity.getTicksLived() >= plugin.cfg.suckInterval()) {
                    inventory.addItem(itemFound);
                    entity.remove();
                    if (plugin.cfg.suckEffect()) {
                      item.getLocation().getWorld().playEffect(item.getLocation(),Effect.CLICK2,0);
                    }
                  }
                  sucked.add(entity.getUniqueId());
                }
 else {
                  break;
                }
              }
            }
          }
        }
      }
    }
  }
}