Theoretically whatever I-94 you may have is entirely irrelevant as far as maintaining legal status as long as you were in status when your I-485 was filed.
Nevertheless INS still requires you to use I-94 when entering on AP. Previously they used to parole you "indefinetely", but recently the policy changed to issuing I-94 for the validity of AP. Nobody knows exactly why the practice has changed or what it means, because, again, as long as your I-485 is pending your are authorized to stay in the US, regardless of what your I-94 says.
Bottomline - talk to your lawyer if you're worried, however I-94 is of no importance to adjustees and long as I-485 is pending. ( As a re-assuring example, consider a situation of a person who originally stayed in US on H1-B and then filed I-485 and never left US until AOS got approved. His H1-B- based I-94 expired before the approval...and he was still considered in status ).