Restore job will complete and not report any error but PDB database will be missing on completion of restore.
This issue is caused due to an Oracle Defect - Bug 27966859
This issue will not be seen if the PDB database is in SHARED_UNDO_MODE with auxiliary path defined.
Solution
Workaround:-
PIT restore of dropped pluggable database will work with SHARED_UNDO_MODE and auxiliary path configured.
For databases which are already in LOCAL_UNDO_MODE please check the below Oracle SR or contact Oracle Support team for alternate options to restore the database.
Reference:- Oracle Support: SR 3-22797947541