Publish Persistent Metadata breaking instances in .swc export?

I'm trying to export publish persistent metadata from JSFL in flash pro.. 

If i export as a swf file it works as expected.. the metaData is available...

Now, if i export an swc instead.. it will make the instance holding the metadata into NULL,

and thereby also removing it from the stage. The name exists but it is no longer is a child.

Surely this cant be correct behaviour? Can anyone confirm this is a bug in Flash Pro? (Using Fl pro CC 2014.1)

jsfl code:

element.setPersistentData( "testvalue", "string", "test123" );

element.setPublishPersistentData("testvalue", "_EMBED_SWF_", true);

fl.getDocumentDOM().setPublishDocumentData("EMBED_SWF", true);