PCG Graph not recognising all the river splines in my scene

I am starting to work with PCGs, the idea is to create a small forest environment just to get the gist of the tool. I have also installed the water plugin to make rivers and lake, and wanted to fit both of the tools together.
I am having an issue though, the Get Spline Data node on the PCG Graph only gets one of the two rivers i have in my scene. Pressing A on the node reveals in fact point only of the first spline, but having the debug option active shows me that it recognise that there are more point belonging to the second river.
To be more specific, in the Graph both in the preview and in the point list it only shows one river, but in the world the second river spline points are correctly debugged. I have tried many things even asking the Dev Assistant tool of Unreal but nothing seems to solve my case.
It could just be that since both and not fully implemented they do not “speak” correctly to one another, or something i am completely unaware of.