Learning objectives are unknown after deleting a LO

## Steps to reproduce
1. Delete a learning objective.
2. Go to "Review & Edit"
3. Filter by learning objective and observe the following:

<img width="1146" height="258" alt="Image" src="https://github.com/user-attachments/assets/f7f08670-2cb5-4f2b-b063-9553ee034945" />