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Hello,The triggering of the UIView animation completion block following code ends up being slowed down by ~100x instead of ~10x with slow animations enabled in the simulator:import UIKit class Animator: NSObject, UIViewControllerAnimatedTransitioning { func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval { return 0.175 } func animateTransition(using transitionContext: UIViewControllerContextTransitioning) { guard let toViewController = transitionContext.viewController(forKey: .to) else { fatalError("to view controller not found") } transitionContext.containerView.addSubview(toViewController.view) toViewController.view.frame = transitionContext.containerView.frame toViewController.view.alpha = 0 toViewController.view.transform = CGAffineTransform(scaleX: 1.2, y: 1.2) let start = Date() UIView.animate( withDuration: transitionDuration(using: transitionContext), animations: { toViewController.view.alpha = 1 toViewController.view.transform = .identity }, completion: { finished in print("animateTransition completion after \(-start.timeIntervalSinceNow)") transitionContext.completeTransition(!transitionContext.transitionWasCancelled) }) } }This results in views not being interactive for a long while when developing with slow transitions on. Completion blocks to calls to UIView animations outside of animateTransition(using transitionContext: UIViewControllerContextTransitioning) are called when expected.Does anyone know why this is?