SwiftUI - Unable to show Google banner Ad in List view?

Question

I am trying to show google ad banner in a List view in alternative cells. such that whenever ads get successfully loaded the cell should automatically expand and show the ad in the list view and whereas the ads gets failed to load the list view cell should collapse and shouldn’t show the ads

The below code snippet is for AdBanner in Swift UI

    struct ContentView: View {
    
    let bannerId = "ca-app-pub-3940256099942544/2934735716"
    var body: some View {
        ZStack {
            VStack(alignment: .center, spacing: 0) {
                navBar()
                    .background(Color.blue)
                List(0..<10) { _ in
                    HStack {
                        FixedSpacer()
                        AdBannerView(bannerID: bannerId, adWidth: 320, adHeight: 50)
                        FixedSpacer()
                    }
                    Text("Hello world!")
                }
                .listStyle(.plain)
                FixedSpacer()
            }
        }
    }
    

import UIKit
import SwiftUI
import GoogleMobileAds

struct AdBannerView: UIViewControllerRepresentable {
    var bannerID: String
    var adWidth: CGFloat
    var adHeight: CGFloat

    func makeCoordinator() -> Coordinator { Coordinator(self) }

    func makeUIViewController(context: Context) -> UIViewController {
        print("makeUIViewController called")
        let bannerView = GADBannerView(frame: CGRect(x: 0, y: 0, width: adWidth, height: adHeight))
        let viewController = UIViewController()
        bannerView.adUnitID = bannerID
        bannerView.rootViewController = viewController
        viewController.view.addSubview(bannerView)
        bannerView.load(GADRequest())
        bannerView.delegate = context.coordinator
        return viewController
    }
    
    @available(iOS 16.0, *)
    func sizeThatFits(_ proposal: ProposedViewSize, uiViewController: UIViewController, context: Context) -> CGSize? {
        CGSize(width: adWidth, height: adHeight)
    }

    func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
        print("updateUIViewController called")
    }
    
    class Coordinator : NSObject, GADBannerViewDelegate {
        var parent : AdBannerView
        init(_ parent : AdBannerView) { self.parent = parent }
        
        public func bannerViewDidReceiveAd(_ bannerView: GADBannerView) {
            print("Ads received successfully")
        }
        
        public func bannerView(_ bannerView: GADBannerView, didFailToReceiveAdWithError error: Error) {
            print("Ad loads to fail: \(error.localizedDescription)")
        }
    }
}

In case if the banner ad gets failed the white space is appearing in the list view cells.

But i am unable to find the solution for this problem. could anyone can help on this issue?

attached the screenshot for the reference Screenshot of the app