I also think so, because AS-RPC is basically not needed for the RPC to track the target - when you go to AS-3 mode (tracking in velocity), the RPC in fact tracks the target in epsilon and beta planes. Range is unknown at this moment, but the target is still illuminated so the missiles should keep flying towards the target.

The other thing is what EXACTLY happens when you disable AS-RPC while tracking is in progress (I will have to try), it could eventually disable also the AS-3, but when the target would be still in the beam of th RPC (as in your case), the missiles in the air must keep guided flight.