Altered Objects' Generated DDL Incorrect

 I'm using DBMS_METADATA to generate DDL for my schema. Some of the Object Types have ALTER statements because of the way they were modified over time. The generated statements for these composite objects are missing critical punctuation. For example:

CREATE OR REPLACE TYPE "MYTEST" IS OBJECT
(class_name VARCHAR2(32) )
 alter type        MYTEST modify attribute CLASS_NAME VARCHAR2(64) cascade
/

Should read:

CREATE OR REPLACE TYPE "MYTEST" IS OBJECT
(class_name VARCHAR2(32) );
/

 alter type        MYTEST modify attribute CLASS_NAME VARCHAR2(64) cascade
/

The generated DDL is missing the semicolon and forward slash after the CREATE OR REPLACE.

Is this a known bug? I thought I'd check here before logging one.