Not quite sure if the card will be valid or just a glitch of the computing system at USCIS. If the I-140 application is reviewed later on and is denied, I believe this green card will be revoked immediately. Other people already reported some one got green card even though the priority date was not current and a suggestion from immigration lawyer is don't use the green card until the priority date is current. So for yur case, my suggestion is still keeping your current status until USCIS confirms everything is correct.