Not sure at what point this happened but I have an older site that either during the upgrade from 4.1 to 4.2 or possibly 4.0 to 4.1 broke the classic accordion. I think it was 4.1 to 4.2 though as the client had asked me to update some of the info. They hadn’t mentioned the issue and I ran the updates before going to edit the info.
Other classic accordions in the site are fine but the classic accordion in the global block lost all its titles and ended up with a message saying something like “Don’t forget to set a titile”