Cannot insert data into package table with fully qualified name

[AlexBekhtin]

RECREATE PACKAGE PACKAGE_WITH_TABLE AS
BEGIN
  TEMPORARY TABLE T_PUB(
    ID INTEGER
  ) ON COMMIT PRESERVE ROWS
  INDEX IDX_T_PUB_ID (ID);
END;

RECREATE PACKAGE BODY PACKAGE_WITH_TABLE AS
BEGIN
END;

INSERT INTO PACKAGE_WITH_TABLE.t_pub values (1); -- Correct
INSERT INTO PUBLIC.PACKAGE_WITH_TABLE.t_pub values (2); 
/*
Statement failed, SQLSTATE = 42000
Dynamic SQL Error
-SQL error code = -104
-Token unknown - line 1, column 38
-.
*/
-- Both selects are working correctly.
SELECT * FROM PACKAGE_WITH_TABLE.t_pub;
SELECT * FROM PUBLIC.PACKAGE_WITH_TABLE.t_pub;

Firebird-6.0.0.2167