When your file is picked up and they make any changes to the profile, the copr number vanishes but comes back in a day or two. So keep track. A ghost update is a good sign that you will get the counterfoil in a few days
Counterfoil updated for me as well. Hope to get dispatch message in next couple of days.
March 10: Reached IRCC
Counterfoil update gckey : 10 April
Ghost update in tracker: 10 April
Many got the automated email yesterday .. some got right after biometrics and other after submission. It's just a system generated and nothing to do with the status