You'll want to stick to a single forum post/issue as to keep the discussion focused. Ramesh responded on [TEIID-2715] Created and registered MXD, extra metadata is not visible when queried. - JBoss Issue Tracker
If you clearly have an issue requiring a fix, then keep responding on the JIRA.
If you can post a vdb that would help determine if Designer included the extension metadata as expected. If you can't post one, then use JDBC to query SELECT * FROM SYS.PROPERTIES - if your extension metadata does not show up, then your initial issue is with Designer.