Course Press Pro "Duplicate Course" not working (Units within course do not duplicate)

I'm trying to duplicate some of my courses in CPP but when duplicating and making a copy of the course, the Units within the course are not duplicated. Can you advise?
Access granted.
This is the only thread I could find on the issue.

https://premium.wpmudev.org/forums/topic/how-can-i-duplicate-courses-in-coursepress-pro