Program: 33859
Project: 33859
Buggy source:
/** 
 * Prevents emptying of buckets outside of island space
 * @param e
 */
@EventHandler(priority=EventPriority.LOW,ignoreCancelled=true) public void onBucketEmpty(final PlayerBucketEmptyEvent e){
  if (DEBUG) {
    plugin.getLogger().info(e.getEventName());
  }
  if (inWorld(e.getPlayer())) {
    Player p=e.getPlayer();
    if (e.getBlockClicked() != null) {
      Block dumpBlock=e.getBlockClicked().getRelative(e.getBlockFace());
      if (actionAllowed(p,dumpBlock.getLocation(),SettingsFlag.BUCKET)) {
        if (e.getBlockClicked().getBiome().equals(Biome.HELL) && e.getPlayer().getItemInHand().getType().equals(Material.WATER_BUCKET)) {
          e.setCancelled(true);
          e.getPlayer().getItemInHand().setType(Material.BUCKET);
          if (plugin.getServer().getVersion().contains("String_Node_Str") || plugin.getServer().getVersion().contains("String_Node_Str")) {
            e.getPlayer().getWorld().playSound(e.getPlayer().getLocation(),Sound.valueOf("String_Node_Str"),1F,2F);
          }
 else {
            e.getPlayer().getWorld().playSound(e.getPlayer().getLocation(),Sound.ENTITY_CREEPER_PRIMED,1F,2F);
          }
          Util.sendMessage(e.getPlayer(),ChatColor.RED + plugin.myLocale(e.getPlayer().getUniqueId()).biomeSet.replace("String_Node_Str","String_Node_Str"));
        }
        return;
      }
      Util.sendMessage(p,ChatColor.RED + plugin.myLocale(p.getUniqueId()).islandProtected);
      e.setCancelled(true);
    }
  }
}

Fixed version (ground truth):
/** 
 * Prevents emptying of buckets outside of island space
 * @param e
 */
@EventHandler(priority=EventPriority.LOW,ignoreCancelled=true) public void onBucketEmpty(final PlayerBucketEmptyEvent e){
  if (DEBUG) {
    plugin.getLogger().info(e.getEventName());
  }
  if (inWorld(e.getPlayer())) {
    Player p=e.getPlayer();
    if (e.getBlockClicked() != null) {
      Block dumpBlock=e.getBlockClicked().getRelative(e.getBlockFace());
      if (actionAllowed(p,dumpBlock.getLocation(),SettingsFlag.BUCKET)) {
        if (e.getBlockClicked().getBiome().equals(Biome.HELL)) {
          if (plugin.getServer().getVersion().contains("String_Node_Str") || plugin.getServer().getVersion().contains("String_Node_Str")) {
            if (e.getPlayer().getItemInHand().getType().equals(Material.WATER_BUCKET)) {
              e.setCancelled(true);
              e.getPlayer().getItemInHand().setType(Material.BUCKET);
              e.getPlayer().getWorld().playSound(e.getPlayer().getLocation(),Sound.valueOf("String_Node_Str"),1F,2F);
              Util.sendMessage(e.getPlayer(),ChatColor.RED + plugin.myLocale(e.getPlayer().getUniqueId()).biomeSet.replace("String_Node_Str","String_Node_Str"));
            }
          }
 else {
            if (Util.playerIsHolding(e.getPlayer(),Material.WATER_BUCKET)) {
              e.setCancelled(true);
              if (e.getPlayer().getInventory().getItemInMainHand().getType() == Material.WATER_BUCKET) {
                e.getPlayer().getInventory().setItemInMainHand(new ItemStack(Material.BUCKET));
              }
 else               if (e.getPlayer().getInventory().getItemInOffHand().getType() == Material.WATER_BUCKET) {
                e.getPlayer().getInventory().setItemInOffHand(new ItemStack(Material.BUCKET));
              }
              e.getPlayer().getWorld().playSound(e.getPlayer().getLocation(),Sound.ENTITY_CREEPER_PRIMED,1F,2F);
              Util.sendMessage(e.getPlayer(),ChatColor.RED + plugin.myLocale(e.getPlayer().getUniqueId()).biomeSet.replace("String_Node_Str","String_Node_Str"));
            }
          }
        }
        return;
      }
      Util.sendMessage(p,ChatColor.RED + plugin.myLocale(p.getUniqueId()).islandProtected);
      e.setCancelled(true);
    }
  }
}