onAppear in List swiftUI not getting called consistenly in iOS 16 and works perfectly in iOS 15

Question

In lists, in iOS 16 onAppear is strangely not getting called for row which are visible later. Im downloading the image in on Appear and then setting it.In iOS 15, on appear is called consistently.

List {
  ForEach(0..<(viewModel.rows.count), id: \.self) { index in
    if let imageModel = viewModel.getImageModel(index: index) {
      SomeCustomView(imageModel)
        .onAppear {
          if imageModel.image == nil {
            imageModell.loadAdBanner()
          }
        }
    }
    if #available(iOS 15.0, *) {
      VStack(spacing: 0) {
        VStack(alignment: .leading, spacing: 16) {
          HStack(spacing: 0) {
            HeaderView(viewModel:
                                      TitleViewModel(headerTitle: viewModel.rows[index].headerTitle))
            Spacer()
            TitleView(viewModel: TitleViewModel(row: viewModel.rows[index]))
          }
          .frame(height: 36)
          .padding(.horizontal, 16)
          .shimmering(active: viewModel.showShimmer)
          .background(viewModel.showShimmer ? .colorDCDCDC : Color.clear)
          CategoriesList(l1Category: viewModel.categories[index],
                         categories: viewModel.categories[index].subcategories,
                         showShimmer: viewModel.showShimmer)
        }
        .padding(.bottom, 16)
      }
      .listRowSeparator(.hidden)
      .frame(maxWidth: .infinity) // Make the row take up full width
      .listRowInsets(EdgeInsets()) // Remove row insets
      .padding(0)
  } else {
 sameCode without listSepeartor(.hidden) 
}