scrollToPosition(int) doesnt work?

MainActivity.java

public class MainActivity extends AppCompatActivity {
    
    private int currentIndex;
    
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        currentIndex = savedInstanceState.getInt("currentIndex");
    }
    
    @Override
    public void onBackPressed() {
        if (getFragmentManager().getBackStackEntryCount() > 0) {
            getFragmentManager().popBackStack();
        } else {
            super.onBackPressed();
        }
    }
    
    public void setCurrentIndex(int i) {
        currentIndex = i;
    }
    
    public int getCurrentIndex() {
        return currentIndex;
    }
}

MasterFragment.java

import com.google.android.flexbox.FlexWrap;
import com.google.android.flexbox.FlexboxLayoutManager;
import com.google.android.flexbox.JustifyContent;

public class MasterFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        MainActivity parentActivity = (MainActivity) getActivity();
        int currentIndex = parentActivity.getCurrentIndex();
        
        FlexboxLayoutManager layoutManager = new FlexboxLayoutManager(parentActivity);
        layoutManager.setFlexWrap(FlexWrap.WRAP);
        layoutManager.setJustifyContent(JustifyContent.SPACE_AROUND);

        MasterAdapter adapter = new MasterAdapter();
        adapter.setData(//);

        RecyclerView recyclerView = findById(view, R.id.recyclerView);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(adapter);
        recyclerView.scrollToPosition(currentIndex);    //POINT OF INTEREST
    }
}