How to reproduce when importing

• Create a new course (Course A)
• Turn on completion tracking in the settings
• Add the "Upcoming events" block
• Add an assignment.
• Set a due date in the future.
• Set completion conditions on the assignment (For example "Make a submission")
• Make sure there are events displayed in the "Upcoming events" block
• Now create a new course (Course B)
• Use the import feature on Course B and find Course A - overwrite course B
• Check the upcoming events block on Course B and see if there are upcoming dates

How to reproduce when using backup/restore

• Reproduce the steps above, but just use backup restore instead of the import feature under "Course reuse"

As far as I can tell it does work when you just use the "copy" feature in the category management.