APEX 24.2.4 running on 19c of the database on-premise.
I get the following error when using APEX Database Object Dependencies for certain Apps:
ORA-20987: APEX - ORA-01086: savepoint 'START_SCAN' never established in this session or is invalid
Use Case 1
It seems that if there are errors, records do show up in the apex_used_db% views. This app has 90 pages.
Use Case 2
If there are no errors, I get the same error message, but no records show up in the apex_used_db% views for the App when the scan completes. This app has 28 pages.
For a smaller app (5 pages), it does complete successfully.