I've seen this bug since the start of season 22 Shockwave and it has been happening since. I have also seen a few other people along with friends and randoms I meet in game that have the same issue. Notably before season 22 there was some stutter and fps drops from using a high polling rate but nowhere near as impactful and disruptive as this, (I would liken the feeling to getting hit by a stun grenade in COD, or walking into a wattson fence. Yes the mouse slow is that severe.)
They claimed to have fixed the high polling mouse lag in one of the season update patches. I think what they claimed to have fixed was actually limiting the refresh rate of the mouse in some way, aka slowing it down. The problem is indeed worse than lag.
