Apparently the black ssr line bug was not fixed, and it looks like total **** on water planes. View screenshot.
Steps to reproduce: Make a big plane or box, apply a reflection material (example in image), look at the top.
If your not getting this effect, make sure ssr is on, your only using dynamic light, and theres no reflection capture, to replicate the exact scene.
This issue is old, and was already reported, then just swept under the rug, as seen here https://answers.unrealengine.com/que…egression.html
Note: The other word for poo that starts with cr is apparently censored here for some reason, so its making it look like im swearing