Reformat (command+option+L) behaves differently with/without selection code block

I use Google formating file.

I have a code block like below:

private boolean isInProgress(A a) {
  return Optional.of(a)
      .map(A::getB)
      .map(C.class::cast)
      .map(C::getD)
      .map(D::getE)
      .stream()
      .flatMap(List::stream)
      .anyMatch();
}

When I press command+option+L without highlighting the code, it would usually reformat the entire class. Since this is the format I want, it says `no lines changed`.

But once I highlight my code block and press again, the reformatting changes the code to

private boolean isInProgress(A a) {
  return Optional.of(a).map(A::getB)
      .map(C.class::cast).map(C::getD).map(D::getE)
      .stream()
      .flatMap(List::stream)
      .anyMactch();

So why the reformatting behaves differently?