Create table, PARTITION, compress ORACLE SUPPORT PLS !

Question

Can someone PLEASE explain to me the following (read carefully):
SQL> create table abc
2 (a number)
3 PARTITION BY LIST(a)
4 (PARTITION A_A values (2),
5 PARTITION A_B values (DEFAULT) COMPRESS);
Table created.
SQL> alter table abc add b number;
alter table abc add b number
ERROR at line 1:
ORA-22856: cannot add columns to object tables
SQL> alter table abc modify partition A_B nocompress;
Table altered.
SQL> alter table abc add b number;
alter table abc add b number
ERROR at line 1:
ORA-22856: cannot add columns to object tables
SQL> drop table abc;
Table dropped.
SQL> create table abc
2 (a number)
3 PARTITION BY LIST(a)
4 (PARTITION A_A values (2),
5 PARTITION A_B values (DEFAULT));
Table created.
SQL> alter table abc modify partition A_B compress;
Table altered.
SQL> alter table abc add b number;
Table altered.
I definetelly think this is a BUG !

Answer 1

14464, 00000, "Compression Type not specified"
// *Cause: Compression Type was not specified in the Compression Clause.
// *Action: specify Compression Type in the Compression Clause.