I just noticed that the Community user edited some of my Meta Stack Overflow posts to CommonMark.
It would appear (I'm pretty sure, but there's no way to know now because the renderer has changed) that this process ruins long-running list items spanning more than two paragraphs.
E.g. I had before:
- First list item. The first list item continues. One leading space makes sure of that. And this is still the first list item, continued still, thanks, single leading space. - Finally, the second list item begins
Community edited it to add the now-required additional leading space, but only for the first continuation and not the second:
- First list item. The first list item continues. There are now two leading spaces, the robot did that. And this is now a stray paragraph, not a part of the list, with no leading space at all. The list is broken. - Finally, the second list item begins. But actually it's now beginning of a new list because of the break above.