Actually, there is something wrong with your understanding

Car 10 is absolutely right.

Because the number of trains that can sell Kano tickets. 10 is operated by two emus, the former train is 1 ~ 8 and the latter train is 9 ~ 16.

There is no problem in selling tickets. The only explanation for this error is that there is an error in the ticketing system, and only 8 cars are mistaken for 16 cars to sell tickets. In this case, passengers on the next train will not be able to get on.

This kind of reconnection train has actually existed for a long time.

For example, the name of reconnection on はやて(E2, 10) +こまち(E3, 6 vehicles) Northeast Shinkansen is as follows:

(← Tokyo? |? Hachi →)?

1-2-3-4-5-6-7-8-9- 10(はやて/hayate)+ 1 1~ 16(こまち/？ Komachi)