@perrfect @superylc @JeanDuhard please post your Certbot versions. You can check using:
certbot --version
(or if you use certbot-auto or letsencrypt-auto, use that instead of certbot).
There were some recent changes to the Let’s Encrypt staging server, which is what’s used when you use --dry-run. If so, it shouldn’t affect your live (non dry-run) certificates.