Entities Not Spawning

Hello, I am trying to make a mini game, but when I try to spawn in any monsters, they dont appear, I think this is because I am spawning them in a world right after teleporting players to it. They are all in the same chunk so that shouldn't be the issue.

the constructor for the zombie, I spawn them by creating a new CSZombie(...);

Code:JAVA

 
    public CSZombie(int round, Location loc, CSMain main) {
        Zombie zomb = (Zombie) CSMain.gameWorld.spawn(loc, Zombie.class);
        for (LivingEntity v : loc.getWorld().getEntitiesByClass(Villager.class)) {
            if (v.getCustomName().equalsIgnoreCase(
                    main.getConfig().getString("KingName"))) {
                zomb.setTarget(v);
                break;
            }
        }
        zomb.setCustomName(ChatColor.GRAY + "[" + ChatColor.RED + ""
                + ChatColor.BOLD + "ZOMBIE" + ChatColor.GRAY + "] "
                + ChatColor.GREEN + "Level: " + round);
        zomb.setCustomNameVisible(true);
        zomb.setBaby(false);
 
        zomb.setMaxHealth((double) round * 5);
        zomb.getEquipment().setHelmet(new ItemStack(Material.CHAINMAIL_HELMET));
        zomb.getEquipment().setItemInHand(new ItemStack(Material.WOOD_SWORD));
        z = zomb;
    }
 
 

 

Can't really see any issues in the code. Have you checked that the method is actually firing?