I think I must have noticed this strange phenomenon before, but then I forgot about it. But whether I ever did notice it before or not, I recently noticed it again, or I noticed it:
I’m guessing that what this means is that if you are in Zone 2, and move to Zone 2/3, you haven’t moved into another zone. And if you are in Zone 3 and then move to Zone 2/3, ditto.
But since I have an Old Git Pass, none of this really matters to me. I just like the oddity of the situation.