Rageborn Mundo skin bug!

Just playing a game as support and the enemy Mundo using the Rageborn Mundo skin threw an his cleaver at me. I didn't see it. The windup animation of his arm going back happened but the cleaver itself never showed. I asked in chat and the top laner said the same thing, that all game the cleavers had been invisible. This is a pretty bad bug to not be able to see his cleavers as laning against him would be horrible. I'm thinking the skin should be disabled or something.