This update broke hibernation for me (kernel 6.6, NVIDIA graphics using Nouveau). Black screen when resuming, kernel seems to panic (not even SysRq helps).
However, the proposed fix
[Service]
Environment="SYSTEMD_SLEEP_FREEZE_USER_SESSIONS=false"
did not seem to have any noticeable effect.
Upgrading to kernel 6.10 restored hibernation, at least for now (fingers crossed!).
Although it still behaves weirdly: when entering hibernation, screen turns black, HDDs spin down, then screen reappears, HDDs spin up again, then machine turns off. Same weirdness on resume from hibernation.
I really hate it when essential functionality breaks 