If you have an "test", test.contentobject_version_object.creator.id (the contentobject_id) is modified when somebody modifies an article. But the test.object.owner.id (the contentobject_id) do not change. It's the id of the first article's creator => the OWNER.
It's quite misleading. But in my case I need the test.object.owner.id to make my website work.
Question : do you know how can I get the owner's node_id, because test.object.owner.id return the contentobject_id