I enabled Markdown on wordpress.com as per Can't get markdown to work on wordpress.com
But it is not actually markdown. When I look at the Preview, it is inserting
<br> when there is a line break in the markdown source. E.g.
This is a *paragraph*. It is all one paragraph. Nor is it a poem.
is converted to
<p>This is a <em>paragraph</em>.<br> It is all one paragraph. Nor is it a poem.</p>
Here is how Stack Exchange interprets the same Markdown source code, in accordance with the specification:
This is a paragraph. It is all one paragraph. Nor is it a poem.
Is this documented somewhere? Did it change? Was it intentional? I'd be interested if there's a workaround for wordpress.com, to handle line breaks correctly.