Fortnite and PUBG no longer playable on iOS 13 due to gesture bug
As 9to5mac reports, most of the issues that make these games unplayable are related to gestures. The triple-finger tap-and-hold gesture seems to be bugged to the point that it steals touches from the game. Any game that requires players to have three fingers on the display seems to be affected by the gesture bug.
PUBG developers have already included an announced in their game that warns players about the issue and advises them to prevent their iPhones from installing the iOS 13 update. The announcement also confirms a fix is in the works.
The only workaround for the issue would be to completely disable the gesture, which is not possible at the moment. A patch might be included in iOS 13.1, which is scheduled to arrive on September 24, but that's just a guess.