I am having artifacts only on this type of single water plane material. Check the stripes on this image.
Other types of materials (translucent and masked) do not present them.
When I rotate the camera the stripes rotate with it, and it only shows them when I'm far away from the plane. This leads me to think is some screen-space effect? Maybe screen space reflections? But I don't have them enabled for this material.
I am only using the scattering node of the single water plane output. And it's just an RGB divided by 1000.
I have no clue of what this could be. I'm using forward rendering just in case it's relevant...