Extreme reflectance values not rendering in-game

With extreme reflectance values, like -999 or 1000, I’m able to create effects on models that are useful since they are somewhat emissive.

It works completely fine in studio, but the effects don’t transfer over in-game.

First example : Neon with -999 reflectance (Foil-like / Color changing effect)


Now, In-game :

The properties of the objects in game appear to be the same, but the effects don’t render.
I made sure to use the same graphics level in studio as on the client.

Here’s a second example : Glass at 0.506 transparency with 1000 reflectance
It creates a snow or ice-like texture when duplicated and put over objects

However, in game it disappears completely

Now, the strangest thing about this, is that it works completely fine on other types of models
Like these other parts used as part of the environment


And cloning things doesn’t seem the be the cause, since it works when i use a spell for example:

(You can see the ice effect on the spike meshes)

Any ideas on how to fix this specifically? I want to keep using the emissive effect it produces.

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