I should be receiving my new GCMS notes soon. In my old ones, i's not blank, it says specifically, "not started". I called IRCC and they said they were not currently referring apps for security checks. They didn't say why.
One immigration lawyer online thought it was because IRCC was worried the app would then sit after that and the check would be irrelevant by the time the CoPR was issued. So, he thought they're waiting to do security close to the time of CoPR issue. Makes sense. Not sure if that's correct though.
Hopefully something's revealed once the borders reopen for tourists on September 7th. But I won't be surprised if not. I wish IRCC was more transparent.