[Bug] Subgrid light sources completely bypass main grid occlusion / light-tightness

While stress-testing the new VRAGE3 lighting pipeline in an enclosed, pitch-black space, I discovered a major light leak vulnerability specific to subgrids.

I initially built a completely sealed room on a main grid containing a catwalk cage structure with a static light block. The shadows and filtering worked flawlessly. However, once I attached the lighting rig to a rotor (subgrid) and introduced multiple moving, multi-colored light sources, the light-tightness broke completely.

The subgrid lights leak aggressively through solid, reinforced armor plates. The effect causes intense colorful artifacts in the Screen Space Reflections (SSR) on exterior landing pads during the day, and completely drenches the outside hull in a bright color bleed at night.

Main grid light sources stay perfectly contained inside the room; the issue is exclusively triggered by light sources mounted onto a subgrid.

Steps to Reproduce

1. Build a completely sealed, light-tight room out of solid armor blocks on a main grid.
2. Inside the room, place a rotor or hinge to establish a subgrid.
3. Attach high-intensity light sources (different colors make it easier to spot) to the subgrid.
4. Walk outside the sealed room to an exterior platform.
5. Observation: The moving colored lights will bleed directly through the solid main grid walls, visible as raw illumination and reflection artifacts on the deck plates outside.