Find all chests in a selection bug

Code (Text):

                for (int x = 0; x != s.getWidth(); x++) {
                    for (int y = 0; y != s.getHeight(); y++) {
                        for (int z = 0; z != s.getHeight(); z++) {
                            Location loc = new Location(s.getWorld(), x, y, z);
                            Block b = loc.getBlock();
                           
                            if(b.getState() instanceof Chest) {
                                chests.add((Chest) b.getState());
                                System.out.println("added");
                            }
                        }
                    }
                }
 

It doesn't add any chests. Do you guys know what's the problem? Thanks.

 

Yeah, the loop runs every time I run the command.

 

So I need to do getLength and not getHeight twice?

 

I did it, still nothing.