Before reporting a bug, I just wanted to double check if it's anything obvious or localized.
The mailing preview pop-up and the "add activity" pop-up from the contact page are two examples of broken functionality on our site. They just don't work. The frame does, you can move it around and close it, but actual interactions with the content don't. It's like it's locked or there was a div over it blocking event dispatch.
Am I the only one with such problems? Is the port of the theme incomplete? I couldn't find any related bug reports. CiviCRM 5.24 on Drupal 8.8.