Thanks. As the old issue was deleted, we had completely forgotten about it.

I think I found another case of the same bug.

- a
    hmm

- b
- c

<ul>
  <li>
  <p>a
      hmmm</p>
  </li>
  <li><p>b</p></li>
  <li>c</li>
</ul>

Notice how the line b now is incorrectly wrapped in a <p> tag.

@JustAPerson that is not related. In fact, that is correct behavior. Babelmark shows two common results, one which is defined in the Commonmark spec and one which follows the original rules. We are in the second group along with the reference implementation. Both agree that b should be wrapped in a <p> tag as the blank line before it forces it to be a loose list item. The difference between the two is that the third item reverts to a tight list in classic Markdown as it is not preceded by a blank line. In contrast, Commonmark applies the loose list to the entire list, not just the items which are adjacent to blank lines. In fact, the Commonmark spec acknowledges that this behavior diverges from classic Markdown.