Weird artifact in single water layer material.

Hi,

in the following images you can see the artifact: the stripes.

They rotate along with the camera and if I zoom in a lot in a particular spot they kind of disappear there but are still present in the farther away locations of the plane. As I get away from that particular spot hey appear again and even larger.

I tried debugging with the visualizations ettings but no luck.

It appears even when the scene is unlit, so it might not be a lighting artifact?

Reflections are off for the material, no refraction neither, just a simple RGB in the scattering.