I’ve been trying to fix a similar issue for two days too since I’m new to ue. No one seemed to have an answer.
The sun reflection wasnt being blocked by objects or the landscape. What fixed it was changing the engine scalability to medium or higher (esp for shadows). Shadows didn’t seem to cast when it was on low.
Then I messed with settings like lumen n rt n the issue was back. I started a new project n only enabled the settings I wanted :
Everything lumen in project settings
Hw rt
Use hw rt when available
Enable rt, dx12 etc
And in the post process vol I change the reflections n their shadows to Ray tracing n turn up their bounces.
The issue hasn’t shown up yet n everything is working good. Except that the landscape is lit even when every light is off maybe coz it doesn’t support lumen.
But since yours is a gully night scene maybe you can move the sun out of camera n ignore the reflection.
Another thing I found which didn’t work was going into directional light n searching for specular n then turning it off.