src/lib/Breadcrumbs.php
protected function add_author_links()
    {
        $author_id = \get_query_var('author');
        $author_name = \get_the_author_meta('display_name', $author_id);

        $this->links[] = $this->currentLink(
            $author_name,
            \get_author_posts_url($author_id)
        );
    }
protected function add_author_links()
    {
        $author_id = \get_query_var('author');
        $author_name = \get_the_author_meta('display_name', $author_id);

        $this->links[] = $this->currentLink(
            $author_name,
            \get_author_posts_url($author_id)
        );
    }
Called if $page === 'author'