Notifications and other information are accessible to students when inside unavailable folder

Problem:  Items that are available, but which are added to a parent folder which is unavailable, generate notifications.

Solution: This appears to be a known bug, with a targeted resolution in a future release.  In the meantime, items that should not be visible to students should be set to be unavailable.  Setting a date restriction on an item will allow it to be managed in bulk using the Date Management Tool.