SELECT any_alias.correct_alias.column FROM.. LEFT JOIN..

DROP TABLE tbla PURGE;
DROP TABLE tblb PURGE;
CREATE TABLE tbla
  ( pk_col_a INT PRIMARY KEY, 
    v_col_a VARCHAR2(50)
  );

CREATE TABLE tblb
  ( pk_col_b INT PRIMARY KEY, 
    fk_a INT, 
    v_col_b VARCHAR2(50)
  );
  
INSERT INTO tbla SELECT 1, '1A' FROM dual;
INSERT INTO tbla SELECT 2, '1A' FROM dual;
INSERT INTO tblb SELECT 1, 1, '1B1A' FROM dual;
INSERT INTO tblb SELECT 2, 1, '2B1A' FROM dual;

SQL> SELECT banner FROM v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production

SQL>
SQL> SELECT b.b.v_col_b
  2  FROM tbla A
  3   LEFT JOIN tblb b
  4  ON a.pk_col_a = b.fk_a;

V_COL_B
--------------------------------------------------
1B1A
2B1A

SQL> SELECT xyz.b.v_col_b
  2  FROM tbla A
  3   LEFT JOIN tblb b
  4  ON a.pk_col_a = b.fk_a;

V_COL_B
--------------------------------------------------
1B1A
2B1A

SQL> SELECT banner FROM v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
PL/SQL Release 12.1.0.1.0 - Production
CORE    12.1.0.1.0      Production
TNS for 64-bit Windows: Version 12.1.0.1.0 - Production
NLSRTL Version 12.1.0.1.0 - Production

SQL> SELECT b.b.v_col_b
  2  FROM tbla A
  3   LEFT JOIN tblb b
  4  ON a.pk_col_a = b.fk_a;
SELECT b.b.v_col_b
       *
ERROR at line 1:
ORA-00904: "B"."B"."V_COL_B": invalid identifier

SELECT a.a.v_col_a
FROM tbla A
LEFT JOIN tblb b
ON a.pk_col_a = b.fk_a;