Are you using LUKS full disk encryption? From my experience, LUKS complicates hibernation.

I’m currently using LUKS full disk encryption which can complicate hibernation. There are some community instructions here https://community.frame.work/t/guide-framework-16-hibernate-w-swapfile-setup-on-fedora-40/53080

FW 16 on Ubuntu LTS has worked flawlessly for me except the battery drain on sleep is really bad (20% per 24 hours). No crashes or freezes or resume from sleep failures as I’ve experienced on other laptops with no vendor support.