cannot delete empty compartment

I have a compartment I created, not containing any resources. When I tried to delete it, it stayed for about 2 hours in a "deleting" state, after which it returned to "active". Under "Work Requests", the status message reads: "Delete failed. The compartment must be empty before you can delete it. Use the Tenancy Explorer to find resources. Learn more about deleting compartments. "Tenancy Explorer" does not show any resources, and I did not create any resources within the compartment. What is going on? How can I delete the compartment?