Why does Azir his W insta kill gangplank kegs?

Gangplank is in a very sorry state in the game right now. And things like this make him even harder to play. When Azir has 2 sandmans (w) near a keg, he can command them to attack the keg. I already find this to be a very weird interaction and the moment he does so the keg instantly dies. Is this is a bug or an intended something?
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