Siteground update broke WordPress

So… after some struggle, I figured out why this site was completely broken. Thanks to a “helpful” update by my provider, this little line was removed from wp-config.php.

require_once(ABSPATH . 'wp-settings.php');

As a result, I was getting errors:
Fatal error: Call to undefined function wp() in wp-blog-header.php

Once I added it back at the end of the file, all is well again. The best I can think is that it was an artifact of my provider’s autoupdate, because this was in the file in its place:
# Disables all core updates. Added by SiteGround Autoupdate:
define( 'WP_AUTO_UPDATE_CORE', false );

I’m putting this out online in the hopes that someone else will find it, and it will help them too! (Because it was crazy…) Good luck wordpressers!