The reverse side of two-sided clear coat materials are not properly lit

Reported in SF [Link Removed]

Materials with the Clear coat property enabled and two-sided property enabled will not react properly to lighting on the “reverse” face of any geometry they are applied to. The reverse face will appear darker and in Path Tracer renders.

Attached a sample scene demonstrating this behavior. Tested using a Box 10m primitive with a Car Paint material, the reverse face on the interior of the box is lit by an area or omni light, but in Path Tracer the box interior will appear completely unlit.

Switching to a two-sided material with clear coat disabled will show proper lighting.

1. Open a Twinmotion scene
2. Place geometry where two-sided faces can be observed
3. Apply any material with the Clear coat property, such as any Car Paint material, to the geometry
4. Enable the material’s two-sided property
5. Observe both faces on the geometry

Result: the reverse face of the geometry won’t react properly to lighting and will noticeably not show the Chameleon or Pearlescent effect properly on this face either, if enabled.