That's no bug. The SM RCS will not be activated before separation from the SIVB. If you really need attitude control on the booster (for what?), you can perform saturn take-over
How about for P52 alignment prior to TLI. The checklist says to make sure that roll, pitch and yaw are all nulled. I have found I need to null a couple, so how can I do it effectively, without attitude thrusters? Is Saturn take-over still the best way?