In all iOS 27 Beta 1-8 UIViewControllerAnimatedTransitioning is broken, it shows black screen when a new screen is opened. This Transitioning works correctly on previous iOS (<27) versions. Check out the attached file with example of source code. Example.txt This bug needs to be fixed ASAP, as it will affect a large number of users upon the public release of iOS 27. Visual demonstration: iOS 27 with broken transition iOS 26 works correctly