Death Blossom Kha'Zix bug (visual only)

When his Q is evolved, the evolved version appears briefly, then reverts back to looking like the original version. The evolved version reappears upon death. steps:

1. play kha'zix
2. put 1 ability point into his q
3. reach level 6
4. evolve his q 5)???
5. profit
6. die
7. look at body