Background: I made a new goal with a week of buffer, set a break or two for it, then decided I didn't want the week of buffer and retroratcheted.

I found that retroratchet moved the breaks forward as well. This is a little counterintuitive, at least given the usual use of breaks for vacations/days off. The only break I'd expect to be affected is any break I'm currently on (i.e. if I'm signalling I didn't want to take that break after all).