The time signatures in the project attached in the first post in this thread are local, i.e. staff-specific, time signatures, which is why there are no bar numbers in the system track and why the casting off is peculiar. There are no global time signatures, and only global ones contribute to bar numbers in the system track.
The really interesting question is how you ended up with local time signatures in this project in the first place. I don’t believe Dorico will ever create them during MIDI import, so presumably you created them yourself. In general you shouldn’t use local time signatures: they should be reserved only for situations in which they are really needed, i.e. when you actually need different meters in different instruments.