Rendering field_view_field with image style

I'm rendering a field from a taxonomy term in node.tpl.php

    if($term = taxonomy_term_load($node->field_test['und'][0]['tid'])) {
              $image_field = field_view_field('taxonomy_term', $term, 'field_image');
              
              print render($image_field);
    }

But the problem is that above code doesn't apply style to image (from "manage display" tab of term). I discovered how to do it - by adding an empty string as additional parameter to field_view_field - then automagically style will start to apply to rendered content, but the question is - is it normal? This look very strange as I thought that style should be applied by default and it looks kinda buggy.