I also ran into this change today.The grep -i fix works for me as well (but the devs recommend upgrading the package).
- Bug#941414: dehydrated fails to find nonce Michael Becker
- Bug#941414: Me too / or upgrade to the latest version ... Jon Daley
- Bug#941414: dehydrated fails to find nonce Jon Daley
- Bug#941414: dehydrated fails to find nonce Mattia Rizzolo