Why can't I keep the MTB I am on when I ride Repack Ridge?

I was riding the Scott Spark RC MTB the other day, and decided to turn off and take it for a spin on Repack Ridge. However, I was disappointed when Zwift put me on the generic Zwift MTB instead. Why? Why can’t I ride the MTB I am on when I ride Repack Ridge?

I have same question.