a recent topic with a similar problem. But only with 2 groups. And yes, the barnumbers are weird to get right. Which group should have the “correct” bar numbers?
And the system track will “break” easily.
edit
I just tried it. In the other topic, the independent meter was just a ossia. So the bar numbers will work.
Here the bar numbers on the parts will be off, and you have to fix them after this passage. In the score, they seem to follow the top staff.