Sending html markup inside code blocks from slack is not converted correctly.

[AliZaib-Emumba]

If I send Markup from Slack inside the code blocks. After converting I get this form of converted markup
<pre><code>&amp;lt;div&amp;gt;Hello World&amp;lt;/div&amp;gt;</code></pre>

What I expect is a markup like
<pre><code>&lt;div&gt;Hello World&lt;/div&gt;</code></pre>

There is an additional amp; that we need to remove in the case of html code.