PDF export doesn't honour the content of HTML macro when it has numbered list

When exporting a page to PDF and it contains an HTML macro with a numbered list, it breaks the number replacing with 1. Please see the both screenshot.

Here is the HTML macro content to replicate the issue:

<ol start='6'>
<li>test test test test test testtest test test test test testtest test test test test testtest test test test test testtest test test test test test</li>
</ol>