Probably because you don't change the weapon to a different gun.
Only the damage type.
It's just a VOID gun that happens to shoot different colored projectiles....
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Might be changing the damage type but the mods still interact weirdly, for some reason stasis loader worked on it when it's damage was switched to stasis and throwing a grenade, but it's a VOID weapon so void loader should only work on it as you say.
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The new linear has permiability and its craftable if you want to test further.