Why does markdown wysiwyg not render HTML tags outside of the wysiwyg toolbar scope?

Hi all.

Why doesn’t the wysiwyg render HTML not part of the toolbar as HTML when in markdown mode? This is valid markdown, and the markdown editor is available to get access to the raw tokens like ** and <div>

This is actually problematic, because the editor can see this and attempt to edit it, destroying the formatting, converting it to character encoded formatting.

Code for repro: