This bug will explain why Aphelios, Twitch, and Xayah are having a considerably bad win rate in patch 11.8 and have been temporarily disabled from the game.
Right after patch 11.8 came to live servers, the 3 marksmen including Aphelios, Twitch, and Xayah have had win rates that are much worse than them during the last patch. According to u.gg, they used to own 46.01%, 47.49%, and 50.48% of win rate respectively. However, when the latest patch came, they have decreased by 3-5% although Riot did not nerf them and Aphelios was even buffed a lot.
After a moderately long period of time, the reason for this has been detected. Specifically, Aphelios, Twitch, and Xayah are having a huge bug that makes them unable to hit critical attacks. Even when you are having 100% crit, they will still be normal ones.
According to some experiments of Vandiril – the bug-finder “god”, this bug appears when they activate their ability to hit multiple targets (Twitch using R, Aphelios using his Infernum, and Xayah’s passive). However, when they use ordinary attacks, crit damage will be normally dealt(?).
Obviously, this bug has a severely bad impact on these champions as their effort for crit items will become completely useless. They even cannot deal considerable damage in fights and for sure, your LP will be stolen by this bug. Riot said that they had known what the problem was and it would be fixed as soon as possible.