The issue once I have the plugin active. 

[Physics.PhysX] cleaning the mesh failed
WaterSystem:ToggleVisibility(Int32)
WaterVisibilityTrigger:OnTriggerExit(Collider)​

That error has nothing to do with this plugin and is entirely unrelated to water and physics in the any game (this is a universal plugin, basic chat and name checking).

and even universal plugins does need its checks so now and then. 

It isn't at all related to anything this or the universal API uses in this case.