Thank you, Sam
It turned out that they do the same thing.
I found systemd service file in
/lib/systemd/system/rpi-display-backlight.service
[Unit]
Description=Turns off Raspberry Pi display backlight on shutdown/reboot
ConditionPathIsDirectory=/proc/device-tree/rpi_backlight
DefaultDependencies=no
Before=umount.target[Service]
Type=oneshot
ExecStart=/bin/sh -c ‘/bin/echo 1 > /sys/class/backlight/rpi_backlight/bl_power’[Install]
WantedBy=reboot.target halt.target poweroff.target
I hope in the next update there will be a solution that does not require users to do anything.
Andrew