InputAccessoryView外观动画卡顿闪烁问题求助

可以看到，在动画到达最终位置前，视图会先出现闪烁，这个问题在真机上同样存在。

最初我以为是自定义InputAccessoryView的问题，但用仅设置红色背景的普通UIView测试后，确认这是UIKit的原生Bug。

以下是最小复现代码：

import UIKit

class ViewController: UIViewController {

    lazy var pushViewControllerButton: UIButton = {
        let button = UIButton()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.backgroundColor = .systemBlue
        button.setTitle("Push View Controller", for: .normal)
        button.addTarget(self, action: #selector(showViewController), for: .touchUpInside)
        return button
    }()

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

    private func setupConstraints() {
        view.addSubview(pushViewControllerButton)
        NSLayoutConstraint.activate([
            pushViewControllerButton.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor),
            pushViewControllerButton.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor),
            pushViewControllerButton.heightAnchor.constraint(equalToConstant: 35)
        ])
    }

    @objc private func showViewController() {
        let viewController = ViewControllerWithAccessoryView()
        navigationController?.pushViewController(viewController, animated: true)
    }
}

class ViewControllerWithAccessoryView: UIViewController {

    let accessoryView: UIView = {
        let view = UIView()
        view.backgroundColor = .systemRed
        view.frame.size.height = 80
        return view
    }()

    override var inputAccessoryView: UIView? {
        return accessoryView
    }

    override var canBecomeFirstResponder: Bool {
        return true
    }

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

内容的提问来源于stack exchange，提问作者adseeAnn