W3C Validator error: Element dl is missing a required instance of child element dd

[henry.wright]

The W3C Validator gives an error when using the gallery shortcode. Here's an example:

[gallery link="file" columns="2" size="large" ids="746,745,741,740"]

I believe markup should be:

<dl>
    <dt></dt>
    <dd></dd>
</dl>

Example of what is being output:

<dl>
    <dt></dt>
</dl>

[desrosj]

I am able to reproduce this when using the Classic Editor, or the Classic block in the new block editor. The theme must not have support for HTML5 galleries.

[pento]

Duplicate of #47665.