Why don't custom permalinks work?

Question

WordPress

Wordpress has a permalink structure like "site.com/%postname%/". Posts with category 29 need to work when you enter https://site.com/dictionary/post-name/. Please tell me why this code is not working:

function dictionary_permalink($permalink, $post) {
    $category = get_the_category($post->ID);
  if (!empty($category) && $category[0]->cat_ID == 29) {
        $permalink = trailingslashit( home_url('/dictionary/'. $post->post_name . '/'));
  }
    return $permalink;
}
add_filter('post_link', 'dictionary_permalink', 20, 3);

function dictionary_rewrite() {
    add_rewrite_rule(
        '^dictionary/([^/]*)/?',
        'index.php?pagename=$matches[1]',
        'top'
    );
}
add_action('init', 'dictionary_rewrite');

Entering https://site.com/dictionary/post-name/ shows 404, entering https://site.com/index.php?pagename=post-name redirects to https://site.com/post- name/ (loads correctly)