You may apply EAD when your 485 is pending.
Your status is not changing due to sub-mission of 485.
Your status is not changing due to applying of AP/EAD.
Your status is not changing when receiving approval of AP/EAD.
Your status does change when you have used either AP/EAD.
Even though you've receive AP/EAD and at a later time, your 485 is denied, your AP/EAD will become invalid automatically.
If your 485 is denied before your AP/EAD being issued, they will not be issued any more.