Chrome Custom Tabs change the default close button not working

I am trying to change the default close button on the actionbar of the custom chrome tabs. I have tried to set using setCloseButtonIcon() However, the default close button still shows. I want to change the close to an arrow.

My code below:

public void openHomePage() {
    final CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
    builder.setToolbarColor(ContextCompat.getColor(getActivity(), R.color.primary));
    final Bitmap backButton = BitmapFactory.decodeResource(getResources(), R.drawable.ic_arrow_back_black_48dp);
    builder.setCloseButtonIcon(backButton);

    builder.setShowTitle(true);
    final CustomTabsIntent customTabsIntent = builder.build();

    customTabsIntent.launchUrl(getActivity(), Uri.parse(mTvHomepage.getText().toString()));
}

I have an observation. Last month, when searching through SO for various chrome custom tab issues, I found this answer suggesting to use 24dp size icon and also found this question saying that it is working fine with PNG.

I have checked your code with using back arrow icon from here.

When I used "ic_arrow_back_black_48dp", it didn't change the default close button to an arrow (see left image).

final Bitmap backButton = BitmapFactory.decodeResource(getResources(), R.drawable.ic_arrow_back_black_48dp);

But when I used "ic_arrow_back_black_24dp", it perfectly changed the default close button to an arrow (see right image).

final Bitmap backButton = BitmapFactory.decodeResource(getResources(), R.drawable.ic_arrow_back_black_24dp);

As it has worked perfectly for me, you should also try with "24dp" size back arrow icon from here instead of "48dp" size back arrow icon.

Screenshot : [ Device: ASUS_Z00UD; OS: 6.0.1 ]