title: initialScrollIndex not working for FlatList react native
body: <p>I am experiencing an issue with the initialScrollIndex of FlatList - the argument of initialScrollIndex is simply ignored and the first item is shown.</p>
  
  <p><a href="https://snack.expo.io/Bk1mkK0zZ" rel="noreferrer">https://snack.expo.io/Bk1mkK0zZ</a></p>