Seems like there are two possibility:
1. systemd-backlight didn't restore the value successfully.
2. It did, but something else changed the value.

Let's try this:
$ sudo systemctl set-default multi-user.target

Reboot and check if this happens.
Use
$ sudo systemctl set-default graphical.target
To change target back to normal desktop environment.

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https://bugs.launchpad.net/bugs/1686268

Title:
  Backlight brightness level not restored after reboot

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