Tab bar item title doesn't reappear after rotation on iPhone Duo

On iPhone Duo, if a tab bar item's title is set to an empty string while the device is in landscape, setting a non-empty title again after rotating back to portrait doesn't display it. The title stays missing.

Filled in FB25015689

Repro:

import UIKit

@main
final class AppDelegate: UIResponder, UIApplicationDelegate {
    func application(
        _ application: UIApplication,
        configurationForConnecting connectingSceneSession: UISceneSession,
        options: UIScene.ConnectionOptions
    ) -> UISceneConfiguration {
        let config = UISceneConfiguration(name: nil, sessionRole: connectingSceneSession.role)
        config.delegateClass = SceneDelegate.self
        return config
    }
}

final class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?

    func scene(
        _ scene: UIScene,
        willConnectTo session: UISceneSession,
        options connectionOptions: UIScene.ConnectionOptions
    ) {
        guard let windowScene = scene as? UIWindowScene else { return }

        let tab = TitleViewController()
        tab.tabBarItem = UITabBarItem(tabBarSystemItem: .favorites, tag: 0)

        let tabBarController = UITabBarController()
        tabBarController.viewControllers = [tab]

        let window = UIWindow(windowScene: windowScene)
        window.rootViewController = tabBarController
        self.window = window
        window.makeKeyAndVisible()
    }
}

final class TitleViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .systemBackground

        let hide = UIButton(configuration: .bordered(), primaryAction: UIAction(title: "hidden") { [weak self] _ in
            self?.setTabTitle("")
        })
        let show = UIButton(configuration: .bordered(), primaryAction: UIAction(title: "visible") { [weak self] _ in
            self?.setTabTitle("Favorites")
        })

        let stack = UIStackView(arrangedSubviews: [hide, show])
        stack.axis = .vertical
        stack.spacing = 16
        stack.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(stack)
        NSLayoutConstraint.activate([
            stack.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            stack.centerYAnchor.constraint(equalTo: view.centerYAnchor),
        ])
    }

    private func setTabTitle(_ newTitle: String) {
        title = newTitle
        tabBarItem.title = newTitle
    }
}