Allow HTML in comment code blocks

I am using Markdown with Smartypants to process comments similar to the example in the documentation for the filters modifier:

<$mt:CommentBody convert_breaks="0" filters="markdown_with_smartypants"$>

This works great except for when comments include certain HTML or Movable Type tags within code blocks.

For example, if a comment contains:

This is comment text followed by a code block

    <p>Example paragraph</p>

It renders as expected, with the angle brackets changed in the code to HTML character entities so the code appears normal to the viewer. The source code looks like:

<p>This is a comment</p>

<pre><code>&lt;p&gt;test&lt;/p&gt;

But when the code blocks contain HTML tags that are not explicitly allowed in comments via the “Limit HTML tags” setting in “Feedback Settings,” the tags are just omitted. This happens when an MT tag appears in the code block.

For example, if a comment contains:

This is comment text followed by a code block with banned tags

    <mt:Entries>Title: <$mt:EntryTitle$></mt:Entries>

It renders with the banned tags removed. The source code looks like:

<p>This is comment text followed by a code block with banned tags</p>

<pre><code>Title:
</code></pre>

If the code block is entirely banned tags, the code block might not even show up at all on the published page. I found if I added specific Movable Type tags to the “Limit HTML tags” list, I could get them to show up, but that seems tedious, and I’d like an elegant solution. How can I accomplish this?