Bionic: busybox sh preseed/late_command

[Thorsten]

1) lsb_release -rd
Description: Ubuntu Bionic Beaver (development branch)
Release: 18.04

2) http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/
initrd.gz 2018-04-18 09:13 45M
linux 2018-04-18 09:13 7.9M

busybox:
  Installed: 1:1.27.2-2ubuntu3

3+4) preseed installation on Bionic, late_command almost the same in Xenial and there is working

preseed.cfg
d-i preseed/late_command string /tmp/late_command

ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Sep 26 2014 /bin/sh -> busybox

syslog:
running: /tmp/late_command

nothing happend on shell:
/tmp/late_command

head late_commaand
#!/bin/sh
printf '' > /usr/lib/finish-install.d/55netcfg-copy-config;

in-target mkdir -p /opt/MegaRAID/MegaCli/;
in-target mkdir -p /root/.ssh;
in-target mkdir /etc/check_mk;

So is there a bug in busybox sh?
How can I debug busybox sh script.sh?

[Thorsten (itopsatheg)]

If I'm using xenial and in pressed file bionic it's working

[Thorsten (itopsatheg)]

If I'm using xenial and in pressed file bionic it's NOT working