Subviews in presented ViewController gets wrong position after rotation

I'm experimenting with UISearchController, but I can't get it right. I present a clean UISearchController from my own UIViewController, and it looks great - but as soon as I rotate the device, it gets shifted a few points up or down.

To recreate this, just do these few steps:

1. Create a new Single View project
2. Delete Main.storyboard from the project files and remove its name from the project settings (Project -> General -> Target -> Main Interface)

In AppDelegate.swift:

application didFinishLaunchingWithOptions...{
    window = UIWindow(frame: UIScreen.main.bounds)
    window?.rootViewController = ViewController()
    window?.makeKeyAndVisible()
    return true
}

ViewController.swift:

class ViewController: UIViewController{
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .white
        let button = UIButton(frame: CGRect(x: 20, y: 200, width: 100, height: 40))
        button.setTitle("Search", for: .normal)
        button.backgroundColor = .black
        button.addTarget(self, action: #selector(click), for: .touchUpInside)
        self.view.addSubview(button)
    }
    @objc func click(){
        self.present(UISearchController(searchResultsController: nil), animated: true, completion: nil)
    }
}

And that's it. This is what I'm seeing:

Presenting the search when the device is in portrait mode looks great in portrait - but if you rotate the device to landscape while presenting the searchbar, it will be wrongly positioned, a few pixels above the top of the screen.

Presenting the search when in landscape will yield the opposite. It looks great in landscape, but when rotating it to portrait the entire search controller view will be pushed down a few pixels.

It's not a matter of height size on the bar. The entire bar gets pushed up/down.

I tried investigating a bit further. I presented the search controller from landscape mode and rotated to portrait, and then debugged the view hierarchy:

To be honest, I'm not quite sure what I'm looking at. The top-most view is a UISearchBarBackground embedded within a _UISearchBarContainerView, which is within a _UISearchControllerView.

As you can see in the size inspector on the right side, the middle-view "container" has y: 5, which makes no sense. When debugging the correct state, y is 0. What's really interesting is that the top-most view has y: -44 in this corrupt situation, and it has the same when it's correct - but you can clearly see that there is some space leftover above it. There seem to be three different y-positions. I don't get it.

I've read some guides on how to implement a UISearchController, but literally every single example I find is people modally presenting a custom ViewController that contains a SearchController. This will result in the entire custom ViewController being animated up from below.

Since the UISearchController is a subclass of UIViewController, I wanted to test out presenting it directly, not as part of a regular UIViewController. This gives the cool effect that the searchBar animates in from above, and the keyboard from below.

But why doesn't this work?

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