Today we've renewed one of our Let's Encrypt certificate using certbot, and it seems it signed it with the new intermediate certificate due to the transition to ISRG's Root.
Unfortunately, we had our certificate distributed on a desktop app with SSL pinning relying on it. This means that our application basically broke.
Just in case, can you think in any way to recover from this situation? Thanks in advance!
Edit: Adding more context, we renewed the cert with the new R3 intermediate cert, while our apps are expecting the old X3 one.