I’m using version 1.2.8, which is the latest available version.
Just in case, I deleted it and reinstalled it.
I do have a custom child theme, but there aren’t any functions in functions.php.
Style.css just fixes the sizes of menu icons and the appearance of the word “Menu” at the top.
I tried it again after temporarily disabling all my plugins, using an empty style.css for my child theme, purging the cache of my site, and pausing my CDN (Cloudflare). It still didn’t work 🙁