eric wrotechroot your system then
# 66-tree -n boot
# 66-enable -t boot -C -F boot@ system
# 66-env -t boot boot@ system # and what you need on the configuration file
# 66-enable -t boot -F boot@ system
exit from the chroot and reboot.
Have no idea what to add or modify boot@ system file.
Tried to add MNT_VAR=!yes, no difference.
The folders, /etc/66/ in two installations, one working with 3 partitions, root(/), /boot and /home, the other none working with 2 partitions, root(/) and /var, are identical.
fstab-3 partitions:
# /dev/sda4 LABEL=04-Obarun-01209
UUID=3c4516b3-63c6-4abd-8e2a-140022815f00 / f2fs rw,relatime,lazytime,background_gc=on,discard,no_heap,inline_xattr,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,alloc_mode=reuse,fsync_mode=posix 0 0
# /dev/sda12 LABEL=12-Home-04
UUID=129f7e71-30ad-4589-a0ab-babda2ecb05f /home ext4 rw,relatime 0 2
# /dev/sda29 LABEL=29-Boot-04
UUID=58677701-88e8-4c4f-bccf-ed825429b080 /boot ext2 rw,relatime 0 2
# /mnt5/pacman/pkg-obarun
# /mnt5/pacman/pkg-obarun /var/cache/pacman/pkg none rw,bind 0 0
fstab-2 partitions:
# /dev/sda5 LABEL=05-Obarun-01209
UUID=c662f88a-81bf-44cc-b1ff-a33386555643 / f2fs rw,relatime,lazytime,background_gc=on,discard,no_heap,inline_xattr,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,alloc_mode=reuse,fsync_mode=posix 0 0
# /dev/sda21 LABEL=21-Var-05
UUID=5fc0b467-2d81-45de-9a5b-933b21ae0264 /var ext4 rw,relatime 0 2
# /mnt5/pacman/pkg-obarun
# /mnt5/pacman/pkg-obarun /var/cache/pacman/pkg none rw,bind 0 0
The last entries in both fstab files are for package caches, blocked manually upon installation before first boot attempt.