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I have no idea what "cubemaps" are, but if I had to guess why the effect you describe is happening, I'd say that it's because the light in the area is insufficient to see the add on. Thus, you only see the shotgun itself.
Kinda like something I did to my car some years back. I used a reflective tape the same colour as the car, so it was very difficult to see in the daytime, but shine headlights on it from behind, and it glowed.
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