Replying to this old post in case since currently this post is the only search result found in either SCN search or xSearch in the support portal for the search term that I used to find it:
SELECT line FROM sys.ext_tab_dbac_alert
--which was the error I got in DBA Cockpit.
Thank you also Pavel and Paul for posting this problem and providing the solution.
Here are updated versions of the queries to use to verify whether the database has the objects and grants and the expected output once the script on the note 1546456 has been implemented:
select owner, table_name
from dba_tables
where lower(table_name) in
('ext_tab_dbac_tnsnames','ext_tab_dbac_sqlnet',
'ext_tab_dbac_listener','ext_tab_dbac_alert');
OWNER TABLE_NAME
------------------------------ ------------------------------
SYS EXT_TAB_DBAC_LISTENER
SYS EXT_TAB_DBAC_TNSNAMES
SYS EXT_TAB_DBAC_SQLNET
SYS EXT_TAB_DBAC_ALERT
select grantee, table_name
from dba_tab_privs
where lower(table_name) in
('ext_tab_dbac_tnsnames','ext_tab_dbac_sqlnet',
'ext_tab_dbac_listener','ext_tab_dbac_alert');
GRANTEE TABLE_NAME
------------------------------ ------------------------------
<SCHEMA> EXT_TAB_DBAC_ALERT
<SCHEMA> EXT_TAB_DBAC_LISTENER
<SCHEMA> EXT_TAB_DBAC_SQLNET
<SCHEMA> EXT_TAB_DBAC_TNSNAMES
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