Kha'Zix ult color change after death bug

I really enjoy having my R evolve on certain skins because I think it makes them look a lot better. I really don't enjoy losing my R evolve color change for the rest of the game if I die once. Please fix this bug, it's been a problem since they reverted his R.

Let me explain in detail what happens, even though it seems redundant. When you evolve your R as Kha'Zix, Kha sheds his skin, changing the color entirely. It's supposed to stay on your champion for the rest of the game, but there is a bug when Kha dies which removes the color change entirely.