RAC PRS Ticket can get canceled after chart preparation, as sooner after charting, if traveler dont wish to fortune his journey, he can rush PRS & get it canceled (Its not awaiting TDR & will be processed ad-hoc)!!
In this case, for Final charting (to be provided just 30 minutes before train departure), the status will come as Canceled!!
Further, its been Marked RAC after charting does implies that the status of ticket was RAC even before charting & may got canceled before charting, while marking been done here as RAC!!