LazyVStack child disappears off screen before its off screen.

I have a scroll view with one item in it. When is scroll it under a the navigation bar it disappears before the whole cell is gone it seems to be about when ½ the cell is disappeared. Simple LazyVStack

  NavigationView {
    ZStack {
       ScrollView {
          LazyVStack {
             ForEach(model.wallets, id: \.id) { wallet in
                GalleryCell(wallet: wallet)
               }
           }
       }
   }