I just found out that our hosting provider upgraded something on the production instance, and the comblog WP site broke in a similar way to https://discussion.fedoraproject.org/t/upgrade-of-the-blog-to-php-8-0-and-wp-6-0/39618/4

So I fixed it by connecting to the prod server and using vim, replicating https://pagure.io/fedoramagazine-theme/pull-request/51 on the 3 widgets.

The upstream theme need to be fixed, but as it is 11:30 PM here, I opened a bug report rather than a PR.