Hi, while searching online on how to do this exact same thing for the same exact variable I ran into this thread. After many hours of testing and slamming my head against the wall, I noticed that the water plugin c++ code was on the Engine and not on the individual project itself. What is shown in visual studio is just a snapshot, not the actual editable code.
So now I’m going to try this https://m.youtube.com/watch?v=DcEBKnJMxng , and see if it works for me. Hopefully it can help you out also. I might get back to you if I find the time to test this out.