There's no privacy benefit that would come from blocking access to partitioned cookies when the Storage Access API permission has been refused or dismissed, and having access to partitioned cookies would be consistent with the existing access to partitioned storage on the device in such a scenario. So partitioned cookies should always be accessible, even if a Storage Access API prompt was previously rejected or dismissed.
There's no privacy benefit that would come from blocking access to partitioned cookies when the Storage Access API permission has been refused or dismissed, and having access to partitioned cookies would be consistent with the existing access to partitioned storage on the device in such a scenario. So partitioned cookies should always be accessible, even if a Storage Access API prompt was previously rejected or dismissed.