After restoring a course that has been backed up, course calendar events (such as due dates) are not appearing in the calendar or in the Upcoming Events block. Editing the activity and saving it again (even without settings changes) causes the activity due date to appear in the calendar and in the Upcoming Events block.

This is similar to (https://tracker.moodle.org/browse/MDL-22895) which affected earlier versions but was fixed - the assignee asked me to repost this issue as the previous one could not be reopened.