install create and subtleEffects on bothside
place a create Waterwheel and Connecting rod
client will disconnect from server.
( if only install subtleEffects on client and do same thing, server will crash )

Please test this again on 1.9.3

on 1.9.3 still have this issue.
Tested with only subtleEffects and create mod( include addons) installed

here is log.
https://gist.github.com/AngleNaris/3c633525af850b85de54317b554a2edb

interesting, this will take some time it fix

This should be fixed