I noticed that when asking a business employee or owner to start a class as a customer visiting the business, the class starts but no other Sims join the class as attendees.
This is immersion breaking, and looking at the tunings, other Sims are supposed to join the class, but I couldn't figure out why they don't. As some objectives require to be social or make friends, it also makes those class less interesting as you only option becomes your teacher.
Tested without mods of course, on multiple businesses.
