Rageborn Mundo Cleavers Invis? [GAMEPLAY]

I was just playing against against a Rageborn Mundo, and my whole team reported that Mundo's cleavers were invisible. How to reproduce: Not sure if it was a one time bug, don't own rageborn Mundo so I don't know if that's all. Only happened once, but my entire team reported it happening and I don't own the skin so I can't check.