Include shortcode within descriptions

Hi, I have enabled functionality to include shortcode within category descriptions and it works great. Unfortunately because the plugin is rendered via a shortcode I would need to enable shortcode functionality within the shortcode. I’ve created a folder in my theme and copied mctagmap_functions.php to it. I searched for all instances of $mctagmap_description = '<span class="tagDescription">' and amended it from

$mctagmap_description = '<span class="tagDescription">' . $tag->description . '</span>';

to

$mctagmap_description = '<span class="tagDescription">' . $tag->description . do_shortcode($content) . '</span>';

but it doesn’t run the nested shortcode. I may be going about this wrong but is anyone able to assist me?

https://ww.wp.xz.cn/plugins/multi-column-tag-map/