iPadOS26: UITabBar doesn't switch selected state

With iPadOS26, if I create a UITabBar, and use that to switch between views, the selected state never updates. I created this simple UIViewController to demonstrate the issue:

class SimpleTabBarController: UIViewController, UITabBarDelegate {

    let tabBar = UITabBar()
    let redItem = UITabBarItem(title: "Red", image: nil, tag: 0)
    let blueItem = UITabBarItem(title: "Blue", image: nil, tag: 1)

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white

        tabBar.items = [redItem, blueItem]
        tabBar.selectedItem = redItem
        tabBar.delegate = self
        tabBar.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(tabBar)

        NSLayoutConstraint.activate([
            tabBar.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            tabBar.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            tabBar.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
        ])

        updateBackground(for: redItem)
    }

    func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
        updateBackground(for: item)
    }

    private func updateBackground(for item: UITabBarItem) {
        switch item.tag {
        case 0: view.backgroundColor = .systemRed
        case 1: view.backgroundColor = .systemBlue
        default: view.backgroundColor = .white
        }
    }
}

The tabBar didSelect item method is called, and the background color gets updated as expected, but the selected state of the UITabBar stays the same.

I files a feedback for a related issue: FB17841678