Keep in mind that I am just someone who is pretty well-versed in citizenship application rules. So maybe you want to double check with someone else if what I am saying is correct. Because as you point it it is a significant delay.Ouch. So much for submitting our package Oct 11th. That's a 4-6 week delay.
On the other hand, if I am right and you need the PCC you risk sending it off tomorrow but then getting a message in several months that your application was incomplete.
But again, a second opinion on this can't hurt.