I'm also seeing this bug. I can reproduce it both in the 26.1 simulator, and on a device running the 26.2 RC.
It happens for me using the following Swift code:
UIView.transition(with: self.contentView,
duration: 0.5,
options: .transitionFlipFromLeft,
animations: nil,
completion: nil)
Topic:
UI Frameworks
SubTopic:
UIKit
Tags: