why the native-stack does not fade-in from bottom on Android 7.1

[hehex9]

As the native-stack's README said

the native stack navigator relies on the platform primitives for animations and gestures

But from what I can see, it doesn't exactly follow the system animations.

On my two android devices (android v7.1 and android v10), every new pushed screen uses the scale-from-center transition, but react-navigation just follows the platform in different api level.

react-navigation re-implements animations and gestures

They choose transition based on the platform.version:

export const DefaultTransition = Platform.select({
  ios: SlideFromRightIOS,
  android:
    Platform.Version >= ANDROID_VERSION_10
      ? ScaleFromCenterAndroid
      : Platform.Version >= ANDROID_VERSION_PIE
      ? RevealFromBottomAndroid
      : FadeFromBottomAndroid,
  default: ScaleFromCenterAndroid,
});

My question is, is that scale-from-center transition just exactly the default behavior of FragmentTransaction.TRANSIT_FRAGMENT_OPEN? (sorry, i'm not an android expert)

If positive, then how can we achieve more native-like animations on android in different api level? Does it depends on any extra configuration that i just missed?

Thanks.