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Meshes not affecting GI. Black in Lumen Scene Vizualisation

Hi, I have an issue with lumen where meshes are not contributing to GI and they are black in the Lumen Scene view. This seems to be an issue with the mesh itself maybe coming from the export (blender). Lumen is on this is not a nanite mesh. You can see a light affecting the back wall and some circular flickering. The random cube I imported is working fine. The walls to the right and left of the light are not receiving any lighting in scene view. Any help would be greatly appreciated.

Lumen Scene Visualiser

Lumen GI Visualiser