System not booting after update

so try downgrading the mkinitcpio… chroot:
manjaro-chroot -a
nstall downgrade:
pacman -S downgrade
downgrade mkinitcpio:

env SKIP_AUTOSNAP=1 DOWNGRADE_FROM_ALA=1 downgrade mkinitcpio

update it:
mkinitcpio -P && update-grub
reboot, and see if it helped… if yes blacklist mkinitcpio from updating, until its fixed:
edit /etc/pacman.conf
and add:

IgnorePkg = mkinitcpio