by Ken Task.
Tracker says it's a regression ...
Have got a 3.11.4+ (Build: 20211223) and am trying to replicate the issue and can't!
So ... am assuming it's specific to this course.
You mentioned you thought you had restored a backup (an .mbz file). Can you see your way to share that backup .mbz file with me? Via Email ... if not too large!
See PM in this system for info. my address.
'SoS', Ken