Leak in HTML parsing

For the following code, 

```
<body>
  <ul>
    <li>Top-level bullet point. </li>
    <p>Nested line.</p>
  </ul>
</body>
```

the command `pandoc -f html -t html` returns only the top-level bullet point:

```
<ul>
<li>Top-level bullet point.</li>
</ul>
``` 

This is pandoc 3.1.12.3 (on MacOS Ventura).