Noticed that I get these when using the Solar Beam staff, yes also using Mowzie's Mobs.
But I can still play. So just a heads up.

https://gist.github.com/Sereath/00e46eaeccc2404bd7482bcd13051c1f

I will look into it, the way I do things right now is pretty cursed iirc

Actually I am doing it the intended way, the issue does not come from me, it comes from Mowzie's Mobs networking code which is not done properly, sadly there is nothing I can do about this.

For what it's worth, it only happens when you are not under the effects of: