Xbox 8 Car Livery Designer 465 Services In Timetable

Why is it, when you make a new livery of the 465, it can ONLY be used on 4 car services in Timetable. In Scenario Planner, it allows you to decide how long you want the trains to be, e,g. 8 cars. But, in Timetable, it only lets you drive it on 4 car services and not 8 car.

Is there a way to drive your new liveried 465 on 8 car services in Timetable?

Anyone else notice or having the same problem with the 465 on Livery Designer and Timetable.