For a long time it was clear that an expired PR card met the Ontario requirements, for up to three years past the expiration date. I could not verify this recently, but noted that the current list of documents that will suffice includes a CoPR.
Which is to say the expired PR card used to suffice but I do not know if it currently does. No harm in going to a Services Ontario office and presenting the expired PR card in conjunction with the CoPR to see how it goes. This would in no way trigger any IRCC action.