When I import a kanban artifact via CSV and I omit the status column and when I browse the kanban, the artifact will appear nowhere. That's because the artifact has no entry in the "changeset_value" SQL table for the status field. Kanban does INNER JOIN and so ignores it.

Other parts of Tuleap such as Cardwall renderer seem to somehow handle that state and display "None" or "Empty". Kanban should align and display such artifacts in its Backlog column to match with the behaviour of the "None" pseudo-value.