In the Assertive profile, it can do rolling stops, but only under circumstances where it is very safe, such as four-way stops with no other driving vehicles present.
I have FSD Beta as well. Even in Assertive mode, I've never actually seen it do a rolling stop, including rural areas with nothing around. I'm not saying it doesn't happen. In fact, I'd prefer it didn't--or at least provide an option to toggle it on and off.