An approved application is irrelevant. What matters is your status in Canada. Whether you are a PR or not. You only become a PR when you are issued a COPR and you land and are admitted into Canada. If an individual is already in Canada, pre-COVID they had to report to an IRCC inland officer for the COPR stamping or go to the border. Only after landing, an individual becomes a PR. When landing, even if the application is approved, COPR issued, the BSO can refuse entry.
The application is in the name of the PA. How can dependents be conferred with PR status without PA being examined (virtually through e-COPR or in person at PoE) and granted PR status. What if PA is not granted a PR status due to any inadmissibility found, even if the application is approved, and depends are conferred PR status before. In this scenarios the entire family will have to be removed from Canada. Under the law, if any family member is found inadmissible, the entire PR application is refused.
Unless you land (virtually or in person) and are admitted, you DO NOT become a PR and continue to be a foreign alien, with a temporary status in Canada.
It may look illogical, and you may say that you are not inadmissible, so your dependents should be allowed, but that us not how law works. Rules re made for general masses and not individual circumstances.