We have DB1 with public link to DB2. Packages refencing tables from DB2 could be selected from DBA_DEPENDENCIES with proper REFERENCED_LINK_NAME, REFERENCED_TYPE, REFERENCED_NAME and REFERENCED_OWNER.
We have LINK in DB1 created for table in DB2. But it is not found in DBA_DEPENDENCIES.
SELECT *
FROM DBA_DEPENDENCIES
WHERE
REFERENCED_LINK_NAME IS NOT NULL