Got a similar issue with my Singapore A350-900 10000th aircraft special livery (9V-SMF). The aircraft status was shown as A350-1000, although all model, texture and config files definitely referred to an A350-900 as @richboy2307 explained. The title was "A350-900 Singapore Airlines - 10000th aircraft (9V-SMF | 2025)"
Apparently the "10000th" confused the plane to be an A350-1000 although the "A350-900" was present as well (in title, ui-variation, ui-type and description)