Shen Pearl Chroma

Hey guys, I was wondering if this is a glitch or not.

I recently purchased infernal shen and the pearl chroma for it. In the skin preview for the chroma. Shen's sword on his back is the same color pattern as shen himself. When I equip the pearl chroma, in game, the sword is the same sword that regular infernal shen has and there are no changes.

Please advise, in my opinion the sword would look way better if it followed the color scheme of the chroma. Thank you.