prompt doesn't seem to do the right thing for nested blockquotes

[brevzin]

Checklist

• I have read the tutorials and know the correct effect of the functional design.
• There are no similar reports on existing issues (including closed ones).
• I found the bug on the latest code of the master branch.

Describe the bug

This markdown:

> a
> > b
>
> c
{:.meow}

renders correctly:

<blockquote class="meow">
  <p>a</p>
  <blockquote>
    <p>b</p>
  </blockquote>

  <p>c</p>
</blockquote>

But if you change the class to prompt-meow (e.g. to use info, warning, etc.), then an extra <div> gets inserted:

<blockquote class="prompt-meow"><div>
  <p>a</p>
  <blockquote>
    <p>b</p>
  </div></blockquote>

  <p>c</p>
</blockquote>

Which causes the last paragraph to be printed outside of the outer blockquote (and thus outside of the prompt). I'm not sure why that is, exactly, but it's something about the prompt-* logic here.

To Reproduce

Add this into any post:

> a
> > b
>
> c
{:.prompt-info}

Expected behavior

I expect to see nested quotes, all within an info block.

Screenshots

Instead, this is how it's rendered:

Environment

Command	Version
ruby -v	2.7.0
gem -v	3.1.2
bundle -v	2.2.17
bundle exec jekyll -v	4.3.1
bundle info jekyll-theme-chirpy	5.4.0

Desktop

Smartphone

Additional context

[github-actions]

👋 Hi @brevzin,

This issue is being automatically closed because it does not follow the issue template. Please DO NOT open another similar issue, try to edit the current issue according to the template, then it will be reopened automatically.