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Just played a normal game as Malphite with both teams having a Janna. During the course of this game I couldn't see the tornado graphics of Howling Gale skill from either Janna, all I could see was dust on the ground. I haven't encountered this glitch in any of the other games I played, having played Janna a couple of times myself as well with no glitch.
Steps to reproduce:
Join a game with Maplhite as your champion.
Have 1 or 2 Jannas in the game.
Let them cast Howling Gale and check if the animation is displayed properly.