Android transition: Buttons not clickable after transition

Question

I'm new to transition and trying a basic example. There are two buttons, "DOWN" and "UP", in the layout. If you click "DOWN", both buttons are supposed to move down to the bottom of screen. If you click "UP", both buttons are supposed to move up to the top of screen.

"DOWN" button works as expected, but when I click "UP" button, nothing happens other than ripple effect on the button. I inserted Log statement in "UP" button's onClick(), but it is not called.

Please point out what I am doing wrong.

Here is the repo. https://github.com/gs20060101/TransitionExperiments.git

Below are some relevant files.

MainActivityFragment.java

public class MainActivityFragment extends Fragment {

    private Scene mScene1;
    private Scene mScene2;

    public MainActivityFragment() {
    }

    @Override
    public View onCreateView(
        LayoutInflater inflater,
        ViewGroup container,
        Bundle savedInstanceState
    ) {

        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        ViewGroup sceneRoot = (ViewGroup) rootView.findViewById(R.id.scene_root);

        mScene1 = new Scene(sceneRoot, (ViewGroup) sceneRoot.findViewById(R.id.scene));

        mScene2 = Scene.getSceneForLayout(
            sceneRoot,
            R.layout.fragment_transition_scene_2,
            getActivity()
        );

        Button downButton = (Button) rootView.findViewById(R.id.downButton);
        downButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TransitionManager.go(mScene2);
            }
        });

        Button upButton = (Button) rootView.findViewById(R.id.upButton);
        upButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TransitionManager.go(mScene1);
            }
        });

        return rootView;
    }
}

fragment_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    android:id="@+id/scene_root"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.gens.transitionplay.MainActivityFragment">

    <include layout="@layout/fragment_transition_scene_1"/>

</FrameLayout>

fragment_transition_scene_1.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout
    android:id="@+id/scene"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World"/>

    <Button
        android:id="@+id/downButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:text="Go"/>

    <Button
        android:id="@+id/upButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@id/downButton"
        android:layout_toRightOf="@id/downButton"
        android:text="Back"/>

</RelativeLayout>

fragment_transition_scene_2.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout

    android:id="@+id/scene"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World"/>

    <Button
        android:id="@+id/downButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="Down"/>


    <Button
        android:id="@+id/upButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@id/downButton"
        android:layout_toRightOf="@id/downButton"
        android:text="Up"/>

</RelativeLayout>