phush0 over on the Timeshift issue identified that util-linux and util-linux-libs caused the issue with not being able to find it.
I downloaded the previous versions from here:
util-linux-2.36.2-1
util-linux-libs-2.36.2-1
And manually installed them. Then edited /etc/pacman.conf to add:
# Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
IgnorePkg = util-linux util-linux-libs
#IgnoreGroup =
And now it is working again without any issues. filo, thanks for the SKIP_AUTOSNAP environment variable, good to know for the future, I just ended up uninstalling autosnap, doing the downgrades, and then re-installing it after I added the IgnorePkg.