Swift: UIAlertController in SwiftUI sheet bug

I would like to include UIAlertController in my SwiftUI project because I have more customization options with UIAlertController than with swiftui alert. I've already partially done that with this code:

struct CustomAlertManager {
    
    static let shared = CustomAlertManager()
    
    private init() {}
    
    func showAlert() {
        let alert = UIAlertController(title: "Achtung", message: "Sie werden weiter geleitet", preferredStyle: .alert)
        let okAction = UIAlertAction(title: "Ok", style: .default) { action in
            
        }
        alert.addAction(okAction)
        
        if let controller = UIApplication.shared.rootViewController {
            controller.present(alert, animated: true)
        }
    }
}

My UIApplication extension:

extension UIApplication {
    var rootViewController: UIViewController? {
        let scene = self.connectedScenes.first(where: { $0.activationState == .foregroundActive }) as? UIWindowScene

        return scene?.keyWindow?.rootViewController
    }
}

But now to my problem: This works pretty much fine but when I want to present an UIAlertController inside of a sheet the alert is not displayed (maybe its is unter the sheet). Note: No, the controller (UIApplication.shared.rootViewController) is not empty, so the .present(_:) method will be called 👍. Best regards!