text: Title: some extraction duplicated in xml
  Body: hi,
  
  I was setting a test site and playing with trafilatura and found a weird bug.
  
  site URL:
  `https://milkfriends.s1-tastewp.com/2024/06/27/ok-this/`
  as this test site is only available for 2 days, so I also attached the simple Gutenberg block code below for you to replicate
  
  Command:
  ```
  html = trafilatura.fetch_url(url, no_ssl=True,)
  ts = trafilatura.extract(html, output_format='xml', include_comments=False)
  ```
  
  the Wordpress Gutenberg htmls below
  ```
  <!-- wp:paragraph -->
  <p>this is sample intro</p>
  <!-- /wp:paragraph -->
  
  <!-- wp:heading {"level":3} -->
  <h3 class="wp-block-heading">intro 2</h3>
  <!-- /wp:heading -->
  
  <!-- wp:paragraph -->
  <p>table below</p>
  <!-- /wp:paragraph -->
  
  <!-- wp:table -->
  <figure class="wp-block-table"><table><tbody><tr><td>a</td><td>b</td><td></td></tr><tr><td>f</td><td>s</td><td>s</td></tr><tr><td>g</td><td></td><td>b</td></tr></tbody></table></figure>
  <!-- /wp:table -->
  
  <!-- wp:paragraph -->
  <p>header table below</p>
  <!-- /wp:paragraph -->
  
  <!-- wp:table -->
  <figure class="wp-block-table"><table><thead><tr><th>b</th><th>s</th><th>h</th></tr></thead><tbody><tr><td>a</td><td>b</td><td></td></tr><tr><td>f</td><td>s</td><td>s</td></tr><tr><td>g</td><td></td><td>b</td></tr></tbody></table></figure>
  <!-- /wp:table -->
  
  <!-- wp:paragraph -->
  <p>list below</p>
  <!-- /wp:paragraph -->
  
  <!-- wp:list -->
  <ul><!-- wp:list-item -->
  <li>this is 1</li>
  <!-- /wp:list-item -->
  
  <!-- wp:list-item -->
  <li>this is 2</li>
  <!-- /wp:list-item -->
  
  <!-- wp:list-item -->
  <li>this is 3</li>
  <!-- /wp:list-item --></ul>
  <!-- /wp:list -->
  
  <!-- wp:paragraph -->
  <p>numbered list below</p>
  <!-- /wp:paragraph -->
  
  <!-- wp:list {"ordered":true} -->
  <ol><!-- wp:list-item -->
  <li>this is 1</li>
  <!-- /wp:list-item -->
  
  <!-- wp:list-item -->
  <li>this is 2</li>
  <!-- /wp:list-item -->
  
  <!-- wp:list-item -->
  <li>this is 3</li>
  <!-- /wp:list-item --></ol>
  <!-- /wp:list -->
  ```
  
  
  It is very simple extraction but I find some elements are extracted twice.
  elements below "this is sample intro" appeared twice but not all of the elements appear twice. some of the list elements only show up once.
  
  See the extraction below:
  
  ```
  <doc sitename="milkfriends.s1-tastewp.com" title="ok this" author="Admin" date="2024-06-27" url="https://milkfriends.s1-tastewp.com/2024/06/27/ok-this/" hostname="s1-tastewp.com" fingerprint="f69d7033beefe32d">
    <main>
      <p>this is sample intro</p>
      <head rend="h3">intro 2</head>
      <p>table below</p>
      <table>
        <row span="3">
          <cell>a</cell>
          <cell>b</cell>
        </row>
        <row span="3">
          <cell>f</cell>
          <cell>s</cell>
          <cell>s</cell>
        </row>
        <row>
          <cell>g</cell>
          <cell>b</cell>
        </row>
      </table>
      <p>header table below</p>
      <table>
        <row span="3">
          <cell role="head">b</cell>
          <cell role="head">s</cell>
          <cell role="head">h</cell>
        </row>
        <row span="3">
          <cell>a</cell>
          <cell>b</cell>
        </row>
        <row span="3">
          <cell>f</cell>
          <cell>s</cell>
          <cell>s</cell>
        </row>
        <row>
          <cell>g</cell>
          <cell>b</cell>
        </row>
      </table>
      <p>list below</p>
      <list rend="ul">
        <item>this is 1</item>
        <item>this is 2</item>
        <item>this is 3</item>
      </list>
      <p>numbered list below</p>
      <list rend="ol">
        <item>this is 1</item>
        <item>this is 2</item>
        <item>this is 3</item>
      </list>
      <p>this is sample intro</p>
      <p>table below</p>
      <table>
        <row span="3">
          <cell>a</cell>
          <cell>b</cell>
        </row>
        <row span="3">
          <cell>f</cell>
          <cell>s</cell>
          <cell>s</cell>
        </row>
        <row>
          <cell>g</cell>
          <cell>b</cell>
        </row>
      </table>
      <p>header table below</p>
      <table>
        <row span="3">
          <cell role="head">b</cell>
          <cell role="head">s</cell>
          <cell role="head">h</cell>
        </row>
        <row span="3">
          <cell>a</cell>
          <cell>b</cell>
        </row>
        <row span="3">
          <cell>f</cell>
          <cell>s</cell>
          <cell>s</cell>
        </row>
        <row>
          <cell>g</cell>
          <cell>b</cell>
        </row>
      </table>
      <p>list below</p>
      <p>numbered list below</p>
    </main>
  </doc>
  ```
  
  