Seems like the kind of thing where it would make more sense if Bran was frustrated/restless/pressing the Blood Raven to escape but the Blood Raven insisting that the flashback was important (letting the reveal be that the flashback wasn't important, Bran's presence there for the time loop to work was important)
I wouldn't be surprised if, when we come back to Bran, he is still greenseeing and witnessing all the things he was meant to.