DML missing from LogMiner results (Oracle 12c)

Hello,

I am trying to view all DML against a table called  'incidents' inside a PDB called 'oem'.

However, I am only seeing DDL against the table and no DML.

Am I missing something?  Here are some steps to reproduce:

# connect to the 'oem'  PDB, then run some DDL:

SQL> sho con_name

CON_NAME

------------------------------

CDB$ROOT

SQL> ALTER SESSION SET container=oem;

SQL> ALTER TABLE incidents ADD SUPPLEMENTAL LOG DATA (ALL) COLUMNS;

# now run some DML:

SQL> select * from incidents;

      I_ID SUBJECT

---------- ------------------------------

         5 b

         1 a

SQL> update incidents set i_id = 6 where i_id = 5;

1 row updated.