There was this blunder I noticed and got corrected in my application. Our work permit was processed by a third party on behalf of the company. So during the processing of the PR, when the UCI got linked, the contact information of primary applicant was automatically updated to that of the third party visa processing agent.Some applicants are reporting security completed on tracker, but when they call IRCC they learn that security is in process. Make sure to check your email spam folder(whitelist cic.gc.ca in email) if you haven't already.
Thanks to the tracker, it came into my notice as I checked via dependant information. Else all mail and information would have been sent to some other mail I'd.
If it happened in my case, it could happen with others too. Better to look into the tracker if contact info is correct and updated.