message: Set the replaced and replacee animation
diff: @@ -64,6 +64,10 @@ class NavigationStack extends React.Component<NavigationStackProps, NavigationSt
  var exitAnim = unmountStyle(false, oldState, oldData, oldCrumbs);
  var oldSharedElements = getSharedElements(oldState, oldData, oldCrumbs);
  }
  + if (crumbs.length == oldCrumbs.length) {
  + var enterAnim = unmountStyle(true, state, data, crumbs);
  + var exitAnim = unmountStyle(false, oldState, oldData, crumbs, state, data);
  + }
  return {enterAnim, exitAnim, sharedElements, oldSharedElements};
  }
  render() {
  