Multiple fenced code blocks break them

[IncandescentChrysalis]

Describe the bug

Multiple fenced code blocks seem to pollute each other

To Reproduce

* List 1

code 1

code 2

code 3

Observed behavior

<ul>
<li>List 1
<pre><code>code 1

code 2</li>
</ul>

</code></pre>

<pre><code>code 3

<p></code></pre></p>

Expected behavior

<ul>
<li>List 1
<pre><code>code 1

code 2
</code></pre></li>
</ul>
<pre><code>code 3</code></pre>

Debug info

Version of library being used:

• markdown2==2.4.13

Extras used:

• fenced-code-blocks

Additional context

Broken for nested lists too.

The following Markdown code:

* List 1
    * List 2

  code 1

  code 2
  ```

code 3

yields:
```HTML
<ul>
<li>List 1
<ul>
<li>List 2
<pre><code>code 1

code 2</li>
</ul></li>
</ul>

</code></pre>

<pre><code>code 3

<p></code></pre></p>

instead of:

<li>List 1
<ul>
<li>List 2
<pre><code>code 1

code 2
</code></pre></li>
</ul></li>
</ul>
<pre><code>code 3</code></pre>

All Markdown code cross-tested with the markdown-it demo.