I haven't used my EAD for employment, as I'm on H1b. Although, I used my AP for traveling in and out of the country, so I a'm not sure whether or not this has put me on EAD automatically. It's so much complication that I have stopped thinking about it and I'm not sure my true status is.
As for the EAD/AP expiration, as long a you have a pending I-485 you can request a renewal. I don't anticipate any problem with that. As for I-485, we're doomed until October 1st when, hopefully, we become current. I never thought I would become statistic, but here we are....lol.