because it’s a WIP 
there’s a forum thread that provides a fixed version and instructions for it (tried googling it but couldn’t find it)
but all in all I expect these features to get cleaned up and streamlined. even when it works, it’s far from being intuitive and the materials all contain wip / unconnected / badly named things. also the gerstner waves only work in the main view (water simply renders flat from a scenecapture or from DrawMaterialToRenderTarget)