Katarina shunpo onto an allied Gangplank's barrel

Hey, I have noticed this visual bug in a few games now, and it's nothing big at all but I still thought it was worth reporting.

Whenever Katarina Shunpos (E) onto an allied Gangplank's barrel, she will play the attack animation and attack the barrel. She does not deal any damage to it however, but just plays the animation; which is rather weird.