Huge world size rendering artifacts

I’m currently creating a level that involves a gigantic landscape that extends far past the typical world boundaries (image attached, that small square is the world). But as a result, I’ve encountered these rendering artifacts that occur on both the scaled up sky sphere and the landscape. After looking around in the editor and online, I have not found any settings that adjust any sort of rendering distances (in case that was the culprit), so I’m at a loss.

Any ideas what I can do to mitigate it?

EDIT: Upon further attempts, I discovered the spherical artifact is caused by the atmospheric fog actor, disabling it does get rid of the artifact, but I would like to keep atmospheric fog in the scene, is there anything I can do to increase the distance at which this weird cutoff happens? The distance scaling parameter on the fog does nothing but make it too subtle to notice, so that’s not an option.

I had the same problem but solved it through scaling up the sky sphere. It took some time but in the end the
artifact you are mentioning was not visible from inside the level, only at the edge of the map.