The above screenshot shows a “shared draft” banner that appears above a topic normally created in staff. It is missing the publish button! Also, as @BlackKnob noted in the original topic:
Would this be related? AFAIK, all new topics in staff now show this banner but not the publish button. Smells like a bug.
When a shared draft category has been established, all new topics within that category are considered shared drafts. The destination category defaults to the category in which the topic was created. The “Publish Shared Draft” button does not display until you choose a category other than where it was created.