Missing colormap for redstone wires in resource packs

Leaves, Water, and Grass are all procedurally colored based on the colormap images in resource packs. Redstone wires are also procedurally colored, but they are missing a color map image.

Note: I am aware the TEXTURE of redstone wires can be changed, what cannot be changed is the COLOR.

What I expected:
redstone_wire.png in assets/minecraft/textures/colormap

What's actually going on:
Impossible to recolor redstone wires