Wrong indentation for paragraph within sublist

[ljw1004]

Given this markdown

1.  List item

    1. Subone

    Paragraph

    7. SubRestart

5.  Another list item

then GitHub and commonmark render it where the first item "List item" has three children: (1) an ordered sublist "[subone]", (2) a paragraph, (3) an ordered sublist "[subrestart]". Here's a picture:

But FSharp.Markdown instead parses it so the first item "List item" only has one child: an ordered sublist whose first item is "subone / paragraph" and whose second item is "subrestart". Here's a picture: