[1.12.2] Changing entity rotation yaw not synced with client

[Meldexun]

I want every 5 seconds to randomly rotate my entity. So i added this to my entity class:

	@Override
	public void onUpdate() {
		if (!world.isRemote && world.getTotalWorldTime() % 100 == 0) {
			this.rotationYaw = world.rand.nextFloat() * 360F;
		}
		System.out.println(this.rotationYaw);
	}

 

But the problem is that the rotation is not synced correctly with the client. It gives me 2 different rotations. Any idea why it doesn't sync correcly?