Sometimes after extraction, although the socket starts healing, sharp bony edge can still remain around the socket which may not be clinically visible after the tissue has formed over it. Since you described your pain as sudden and sharp, that too on chewing from that side for the first time, I would advice you to go the dentist and get that bone around the socket filed. Once they have smoothened the sharp edges of the bone, I think you will be fine.
Next Steps
get that area evaluated for sharp bony edges. if there are any, get them filed.