Light opacity won't working

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Issue description

I'm trying to create a custom light source (with custom 3D models) but the light opacity always set back itself to 0.
Is this some kind of applied feature or it is a bug? It's seems like a bug.

Issue comments

Custom 3D models (any non cube model) should have light opacity of 0 or rendering problems will occur.

Okay thank you :)

But the custom model completely changes color when it is away from the light. There's a way to avoid this?