Table of Contents generated incorrectly for headers embedded in lists.

[colewerner]

Below is an example where the Table of Contents is generated incorrectly when there are headers embedded within lists:

# Title

[TOC]

## Section 1

1. List Item 1

    ### Subsection 1
    Explanation 1

2. List Item 2

    ### Subsection 2
    Explanation 2

## Section 2

## Section 3

Below is the output for the above markdown. You can see that Subsection 1 and 2 are actually put under Section 3 instead of Section 1 in the table of contents.