Trying to replace Vanilla Zombie with custom entity.  With code, I am having random game hangs. Only Occasionally so its hard to tell exact problem.  Game occasionally hangs at 100% when loading. Other times it hangs when playing.  Never crashes, just everything freezes except player, Player can still move around in loaded chucks but cant interact with anything.  Any ideas?

 

@SubscribeEvent
    public void copyZombie(final EntityJoinWorldEvent event) {
        World world = event.getEntity().world;
        if (!world.isRemote) {
            if (event.getEntity() instanceof ZombieEntity) {
                if (!(event.getEntity() instanceof ZombieCopyEntity)) {
                    ZombieEntity zombie = (ZombieEntity) event.getEntity();
                    ZombieCopyEntity copy = new ZombieCopyEntity(EntityReg.ZOMBIECOPY, world);
                    copy.setPosition(zombie.getPosition().getX(), zombie.getPosition().getY(), zombie.getPosition().getZ());
                    event.setCanceled(true);
                    world.addEntity(copy);

                }
            }
        }
    }

 

 

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