I'm dealing with some custom potioneffects. As there are a lot of potioneffects I'm going to implement, I use reflect to expand the potion list which origin size is 32.

Things seem to be fine but when I try to render the effects in the client side, I found that the potioneffect did not disappear in the client side, that I try to render the effect all the time after the entity get the effect.

It seems the client would receive a packet about the disappearance of the potioneffect, but as you can see, I don't think it works well. Maybe there are some strange feature handling the potioneffects? Like the packet only send with ID less then 32 or something.

Could someone help?

Change the update tick.

Yes I change the onUpdate like what the SRC do in the code.

Decrease the duration of the effect.

---

public boolean onUpdate(EntityLivingBase par1)
    {
        if (this.duration > 0)
        {
            this.deincrementDuration();
        }
        par1.addPotionEffect(new PotionEffect(8, 2, -8, false));
        AttributeInstance atins = par1.getEntityAttribute(SharedMonsterAttributes.movementSpeed);
        AttributeModifier mod = new AttributeModifier(Utils.MyFreezeSpeed,"Freeze",-1.0F,2);
        if (atins.getModifier(Utils.MyFreezeSpeed) == null) {
        	atins.applyModifier(mod);
        }
        if (this.duration % 140 == 0) {
        	par1.attackEntityFrom(new MyDamageSource("FreezeDamage", null, 7, 2.0F), 2.0F);
        }
        return this.duration > 0;
    }

Every times it updates you are giving the entity the effect again.

I'm not giving the same potion effect to the entity.

The potion effect I give the entity first, let's to say, ID=44, and to perform the effect, I give another potioneffect with ID=8.

OK I got it, as the when the entity(not player)'s potioneffet disappear, there is no packet from the server to the client. But the server tracks the player's potioneffet status. So I send packet to the player around the entity I'm handling slove the problem.