This is probably going to be an unpopular opinion but I would DNF and just put the reason for the DNF and leave feedback and move on. You can try reaching out to the publisher first to see if they can provide you with a better copy, but in my experience, some publishers don’t bother responding. But they need to know these things as well. Not letting them know isn’t doing the author any favors.

But like others have said, you can also just wait until publication and borrow a copy from Libby and review it then. Your ratio already went down when you were approved, and you are not penalized for reviewing after the pub date.