[GAMEPLAY] Strange Senna Behavior During Auto Attacks at High Mist Stacks

This occurred while I was messing around with infinitely stacking Senna's mist stacks on the practice tool. For sake of science, I will list all the steps I did leading up to the final result.

• First I purchased a Runaan's Hurricane, Rageblade, and 4 Wit's End, and set myself to max level.
• Then I set up 3 training dummies in close proximity to each other.
• Upon reaching around 600 stacks of Mist, Senna would begin clipping backwards during auto attacks, then stutter stepping forwards once she was out of range. This process repeated infinitely and only got worse as more and more stacks piled on.

I have included two pictures of the extremes of this sliding (where she blinks back to, as well as where she steps forward to afterwards), as well as a gif of this happening: https://imgur.com/a/D6oBDBp