Foliage is casting light on landscape

Dear Unreal Developers,

this might be a trivial question but I could no figure out a solution to my problem.

We have created a Landscape and added foliage (S_Sea_Wheatgrass_ui2oagjia_0_Var10_lod0) to the level.

The Problem: They cast some sort of Light onto the Landscape. If we get closer with the camera, it looks less strong, but becomes like a bloom from further away.

Note: Since it is not for a Game, we are not bound to any fps or optimizations. We want to create a shot and Render it in the best possible Quality with the MovieRenderQueue.

Thanks in advance!

Update: We figured out it has to do with Lumen and Two Sided Foliage. It seems to cast to much occlusion on the Landscape below.