Or fetch more stories in a loop until N non-resteemed is encountered

Yeah that's already happening (up to a certain limit), it just didn't trigger that logic in this special case. It will do it if it registers a scroll event that hits the bottom, but in the case where there isn't any to begin with it won't trigger. In this particular case, it might be beneficial to have a little button that forces a load, like a "load more" button.