Wait... I'm talking about the camp "in the middle of nowhere", where you chose to go to dementlieu, Barovia, Perfidus, etc.
I arrived, got inside the merchant wagon, sold my stuff and, whan I exited, the camp was empty.
I changed PC's, waited for the dawn, and relogged (and found Mason Moonshadow inside the wagon, going to Barovia).
So, IDK: the Vistani Camp in the "crossroad" has any spawn?