The current behavior was actually a feature requested from folks who specifically didn’t want it remembering which branch you were coming from since they found their normal pattern was to back out and usually then either create a new branch to explore or to continue along the main branch. I think their primary use case was doing reviews though, not exploring joseki, which I could see the current behavior as being particularly annoying.
So, I guess I’d like to poll the community a bit and see how folks feel about it… anyone still in favor of the way it currently operates?