iOS 26 UITabBar size issue

On iOS 26 not able to control size of UITabBar. Sharing code below. Colour is applying correctly but somehow _UITabBarPlatterView which turns out as TabBar is not extending; leaving spaces on left, right & bottom sides.

class CustomTabBar: UITabBar {
    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .red
        
        let firstItem = UITabBarItem(title: "Home", image: UIImage(systemName: "house"), tag: 0)
        let secondItem = UITabBarItem(title: "Search", image: UIImage(systemName: "magnifyingglass"), tag: 1)
        let thirdItem = UITabBarItem(title: "Profile", image: UIImage(systemName: "person.circle"), tag: 2)
        
        items = [firstItem, secondItem, thirdItem]
        selectedItem = firstItem
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

class ViewController: UIViewController {
    let tabBar: CustomTabBar = {
        let tb = CustomTabBar()
        tb.translatesAutoresizingMaskIntoConstraints = false
        return tb
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .systemBackground
        view.addSubview(tabBar)
        NSLayoutConstraint.activate([
            tabBar.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 25),
            tabBar.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -25),
            tabBar.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
        ])
    }
}

when specifying height in CustomTabBar explicitly...

func alignInternalSubViews() {
        subviews.forEach { subView in
            subView.translatesAutoresizingMaskIntoConstraints = false
            NSLayoutConstraint.activate([
                subView.topAnchor.constraint(equalTo: topAnchor),
                subView.leadingAnchor.constraint(equalTo: leadingAnchor),
                subView.trailingAnchor.constraint(equalTo: trailingAnchor),
                subView.bottomAnchor.constraint(equalTo: bottomAnchor),
                subView.heightAnchor.constraint(equalToConstant: 62)
            ])
        }
    }

What should I need to do in order to get this capsule _UITabBarPlatterView and its subviews resize accordingly?