Sharp eyed visitor Andrew Storey noticed that Dando (Verge 2123) had vanished, leaving an orphaned xboat stop.
This is one of the locations that was identified as a mismatch between the Atlas of the Imperium and the GEnie data during the COTI cleanup - there's no world in that hex in AOTI!
As such, the world was removed, but the route remained. Fortunately, the xboat routes in verge are my own creation (pretty much the only one on the map!) so it was easy to reroute those lost couriers through nearby Turin.