If you use systemd-sysext, transactional-update script stops working and bails
out with syntax errors.
/dev/mapper/cr_root / btrfs
ro,seclabel,relatime,space_cache=v2,subvolid=333,subvol=/@/.snapshots/56/snapshot
0 0
sysext /usr overlay
ro,seclabel,nodev,relatime,lowerdir=/run/systemd/sysext/meta/usr:/run/systemd/sysext/extensions/strace/usr:/usr
0 0

node122:~ # transactional-update dup --no-selfupdate
transactional-update 4.8.3 started
Options: dup --no-selfupdate
Separate /var detected.
/sbin/transactional-update: line 1505: [: /: integer expression expected