PDB not shown on Standby after drop and recreate of PDB with same name on Primary (Doc ID 2456325.1)

Example :-

 Customer initially had a PDB TEST_PDB with con_id 6 :

SQL> show pdbs

  CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 PDB_1 READ WRITE NO
4 PDB_2 READ WRITE NO
5 PDB_3 READ WRITE NO
6 TEST_PDB READ WRITE NO

 TEST_PDB was then dropped and recreated with same name and it got assigned same con_id 6 which was before dropping the PDB :

SQL> show pdbs                       

  CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 PDB_1 READ WRITE NO
4 PDB_2 READ WRITE NO
5 PDB_3 READ WRITE NO
6 TEST_PDB READ WRITE NO


++ After drop and recreate , PDB TEST_PDB with con_id 6 is not listed on standby :

SQL> show pdbs

 CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 PDB_1 READ ONLY NO
4 PDB_2 READ ONLY NO
5 PDB_3 READ ONLY NO

But alert log of standby shows PDB creation was successful :


Alert log abstract from Standby
---------------------------------------
2018-08-15T23:37:14.516780-07:00
Recovery created pluggable database TEST_PDB
2018-08-15T23:37:15.702751-07:00