Weird graphics fragments at "EPIC" graphics quality setting

[HootyTooty]

Summary

When i set my graphics to “Epic” there are these weird black fragments at certain areas of my custom meshes.
When i set my graphics to anything lower than epic, they render as expected.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

Happens on custom meshes. Very low poly.

Expected Result

Render as expected

Observed Result

Weird dark fragments

Platform(s)

PC

Additional Notes

I got a 5070 TI

[HootyTooty]

How it looks on EPIC. Its basically a tunnel down.

How it looks on any setting below epic:

[HootyTooty]

Another example:
EPIC:

High:

[HootyTooty]

I found out that the Global Illumination setting is causing this issue. I can make the fragments appear and disappear in the engine by toggeling global illumination from epic to high. This works for both in engine and in game.