getItemViewPosition always return null but not under OnTabSelectedListener

I found out something interesting the getItemViewPosition always return null after added all the items, but it won't return null if I put under setOnTabSelectedListener.
Here is the code snippet
homepageTab.setTitleState(AHBottomNavigation.TitleState.ALWAYS_SHOW);
homepageTab.setAccentColor(getResources().getColor(R.color.colorPrimary));
homepageTab.setForceTint(true);

AHBottomNavigationItem item1 = new AHBottomNavigationItem("Questions",
R.drawable.survey_tab_icon);
AHBottomNavigationItem item2 = new AHBottomNavigationItem("Nearby",R.drawable.peoplenearby );

AHBottomNavigationItem item3 = new AHBottomNavigationItem("Chat",
R.drawable.message_selector);
AHBottomNavigationItem item4 = new AHBottomNavigationItem("Me", R.drawable.me_selector);

ArrayList< AHBottomNavigationItem> itemArrayList = new ArrayList<>();
itemArrayList.add(item1);
itemArrayList.add(item2);
itemArrayList.add(item3);
itemArrayList.add(item4);

// Add items

homepageTab.addItems(itemArrayList);

homepageTab.setCurrentItem(0);

// for smooth swipe
viewPager.setOffscreenPageLimit(3);

Log.d("HomePage123","OutSide tabSelected " + homepageTab.getViewAtPosition(0) );

// Set listeners
homepageTab.setOnTabSelectedListener(new AHBottomNavigation.OnTabSelectedListener() {
@Override
public boolean onTabSelected(int position, boolean wasSelected) {
viewPager.setCurrentItem(position,false);
homepageTab.getViewAtPosition(0);
Log.d("HomePage123","Under tabSelected " + homepageTab.getViewAtPosition(0) );
return true;
}
});

Here is the log output :

Start by tracing getViewAtPosition and the view initialization performed by addItems, then compare the call timing before and inside OnTabSelectedListener. Reproduce the logged behavior with the provided four-item setup and determine whether the method should return a view immediately after addItems; done means the behavior is consistent and covered by a regression test.

Written by the indexing model from the issue text.