Table of Contents Plusの見出し、記事内の内部リンクを拾ってしまう

function my_custom_blogcard_shortcode($atts)
{
  $atts = shortcode_atts(array(
    'id' => '',
  ), $atts, 'my_blogcard');

  $post_id = intval($atts['id']);
  if (!$post_id) return '';

  $permalink = get_permalink($post_id);
  $title = get_the_title($post_id);
  $thumbnail = get_the_post_thumbnail_url($post_id, 'medium');
  $excerpt_raw = get_the_excerpt($post_id);
  $excerpt = wp_trim_words($excerpt_raw, 40, '<span class="more">…もっと読む</span>'); // ← 40語まで、必要に応じて数字を調整


  // カードHTML
  ob_start(); ?>
  <a href="<?php echo esc_url($permalink); ?>" class="my-blogcard">
    <div class="blogcard-container">
      <?php if ($thumbnail): ?>
        <div class="blogcard-thumb">
          <img src="<?php echo esc_url($thumbnail); ?>" alt="">
        </div>
      <?php endif; ?>
      <div class="blogcard-text">
        <p class="blogcard-title"><?php echo esc_html($title); ?></p>
        <p class="blogcard-excerpt"><?php echo $excerpt; ?></p>
      </div>
    </div>
  </a>
<?php
  return ob_get_clean();
}
add_shortcode('my_blogcard', 'my_custom_blogcard_shortcode');