If there is a blank line inside a multi-line HTML comment, pulldown seems to think that the comment has ended and starts interpreting the rest as-if it is Markdown.

Example:

<!--

**foo**
-->

Renders as:

<!--
<p><strong>foo</strong>
--&gt;</p>

Since the comment end is escaped, the rest of the document will not display.

I would expect it to render as:

<!--

**foo**
-->