(Filing this as it's confusing, see e.g. T105634)
- Go to http://korma.wmflabs.org/browser/
- Expand the menu bar on the left
- See both "Tickets" (for defunct Bugzilla) and "Maniphest" sections
Either remove the "Tickets" section and keep the "Maniphest" section, or (probably better for consistency, seeing the generic titles of the other sections) move the content of the "Maniphest" section into the "Tickets" section ('overwrite').