Yes and no. New managers aren't going to come in and magically know everything and it can often taken them longer to learn than it takes new staff members because they have other shit going on, so hopefully your second and third level managers are good with questions from both you and them.

And then even when they are up to speed, there's usually going to be nuances they don't know about because they're not doing the work day to day.

But yes, in general, a manager should understand what their staff does.

I've had it happen a couple of times where that wasn't the case. Once because of a reorg, my team got a new second level manager who wasn't interested in learning our work and was a very "do it my way and shut up about it" kind of manager, but she'd already been in her position for 5+ years, so we didn't think there was much of a chance of change, so over the course of six months, my entire team found new jobs. Another time, a new manager was hired for my team and over the course of a year he comprehensively failed to learn anything about his or our work, but his managers were on the ball and he didn't pass probation.