[Yuumi] - Infinite shied stacking

So I just played a game and apparently Yuumi has some weird bug letting her shied stack infinitely and if the champion she attaches to has shied bash it can pretty much oneshot everyone in the game, this is gamebreaking and needs to be disabled. Don't exactly know how to reproduce because I was on the receiving end, enemy team said something about killing raptors. [Here is an image](https://i.imgur.com/Rf0YMxK.jpg)
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