ios – UITabBarController as secondary controller in UISplitViewController is producing 2 navigation bars in compact view

It is a little bit of an odd one, however when utilizing UIKit (I’ve tried it in SwiftUI and the identical consequence does not occur), and trying to put a UITabViewController because the secondary merchandise in a UISplitViewController, an additional UINavigationBar is introduced on the secondary view controller, however solely when seen in its compact kind. Chosen one other tab and revisiting that view fixes the issue. Listed here are some photographs – a direct screenshot and one from the view debugger:

Picture of downside on iPhone
Picture of view debugger displaying two tab bars

Right here is my code, I’ve pulled it out of a bigger mission nevertheless it nonetheless is reproducible:

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

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

        let splitViewController = UISplitViewController(model: .doubleColumn)

        let primaryVc = UINavigationController(rootViewController: PrimaryTestUIViewController())
        let tabBar = UITabBarController()
        tabBar.viewControllers = [UINavigationController(rootViewController: SecondaryTestUIViewController()),
                                  UINavigationController(rootViewController: SecondaryTestUIViewController()),
                                  UINavigationController(rootViewController: SecondaryTestUIViewController())]

        let secondaryVC = tabBar

        splitViewController.viewControllers = [primaryVc, secondaryVC]

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

class PrimaryTestUIViewController: UIViewController {

    override func viewDidLoad() {
        tremendous.viewDidLoad()
        title = "Main view"
    }

}

class SecondaryTestUIViewController: UIViewController {

    override func viewDidLoad() {
        tremendous.viewDidLoad()
        title = "Secondary view"
    }

}