Count argument in get_terms has no effect on ouput/doesn't work

Not sure from which version, but count argument not used anymore.
Just checked WP_Term_Query class and found nothing related to count argument in get_terms() method, but you can still find it in constructor of this class.
To return terms count only, you need to set count for fields argument.

get_terms(
    array(
        'parent' => $categoryId,
        'taxonomy' => 'category',
        'fields' => 'count'
    )
);

The function wp_count_terms() just do the same.

function wp_count_terms( $taxonomy, $args = array() ) {
    $defaults = array('hide_empty' => false);
    $args = wp_parse_args($args, $defaults);

    if ( isset($args['ignore_empty']) ) {
        $args['hide_empty'] = $args['ignore_empty'];
        unset($args['ignore_empty']);
    }

    //HERE IT SETS COUNT VALUE FOR YOU
    $args['fields'] = 'count';

    return get_terms($taxonomy, $args);
}

It’s not the first time I noticed, that english version of codex is outdated. For example spanish codex don’t have a ‘count’ argument – https://codex.wordpress.org/es:Function_Reference/get_terms

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