$Alphatest causing models to go dark

[VpSnipes]

When shining a light (flashlight typically), on any model that uses $alphatest; causes the model to not take light properly-even without the flashlight. Below are two images; one with the alpha on, and the other off.

You can see how the light affects the one with it off, as a model typically should look if a light is shined on it. Puzzled as to why this is the case, below are the VMT parameters for the Body, cape isn't any different.

"PBR"
{
	"$basetexture" 			"models/souls/ds3/c1280/var1_body_a"
	"$bumpmap"       		"models/souls/ds3/c1280/var1_body_n"
	"$mraotexture"   		"models/souls/ds3/c1280/var1_body_mrao"
	"$speculartexture"  	        "models/souls/ds3/c1280/var1_body_r"
	"$envmap"        		"env_cubemap"

	"$surfaceprop"   		"metal"
	"$model"         		"1"
	"$alphatest"			"1"
	"$alphatestreference"	        "0.6"
}

Creating a large pack with this shader would be beneficial for Garry's Mod, especially if it garners a lot of attention. Issues with lighting regarding the $alphatest, are problematic; personally, I'm not sure if there's ways around this that I'm not aware of. When the pack is uploaded, I'll provide a link here should it gather a large group of people; maybe then, Rubat might actually make it required--if he sees a real need for it.