Me an My wife both have recently travelled to Pakistan (May 30th) on valid AP and believe it, it is very very safe, they just look at the AP make a copy of it and let us go through the immigration no question asked. They don't even bother to look at the I-485 receipt notice or any other documents which I was carrying with me.
One more advantage of travelling on AP as per immigration officer -- "You don't have to do the Registration any more".
One more advantage of travelling on AP as per immigration officer -- "You don't have to do the Registration any more".