message: Used key instead of url
diff: mountedStyle={{opacity: 1, translate: 0}}
  crumbStyle={{opacity: 0, translate: 0}}
  stateNavigator={stateNavigator}>
  - {({opacity, translate}, scene, url) => (
  - <div key={url}
  + {({opacity, translate}, scene, key) => (
  + <div key={key}
  className="scene"
  style={{
  opacity,
  