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.
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