BF2MARC: duplicate $0 fields shown for Authority resources

Steps:

1. Create Work with Instance

2. Go to Work

3. Go to Creator and Contributor

4. Select “Assign”

5. Find authority resources → Assing

6. Save and keep editing

7. Select “Actions” for Instance → Select “Edit”

8. Select “Actions” → “View MARC”

9. Verify authority fields

Actual result:

$0 shown twice.

Open

Expected result:

Sub-fields should not be duplicated.