I am pretty sure. When I active only RS and RWT in MO I can reproduce the issue and when I deactivate RS it goes away. There is actually single lantern behind that bridge. Looks like RWT have a feature which makes water in lakes and ponds more calm, so it needs to change textures, while RS wants to keep vanilla textures. I've also found another places with the same problem, in Riften docks and near that hunters camp under the warrior/wizard/thief stones. I will try to make a patch with TES5edit.