Comment # 1 on bug 1197996 from Lubos Kocman

Must have been a messup from my side

lkocman:/home/lkocman/Downloads # xzcat
openSUSE-Leap-Micro.aarch64-5.2.0-Default-Build150300.9.29.raw.xz | dd bs=4M
of=/dev/sdb iflag=fullblock oflag=direct; sync
611+0 records in
611+0 records out
2562719744 bytes (2.6 GB, 2.4 GiB) copied, 133.304 s, 19.2 MB/s

with

lkocman@lkocman:~/Downloads> find /var/run/media/lkocman/ignition/
/var/run/media/lkocman/ignition/
/var/run/media/lkocman/ignition/ignition
/var/run/media/lkocman/ignition/ignition/config.ign
/var/run/media/lkocman/ignition/lost+found
find: ���������/var/run/media/lkocman/ignition/lost+found���������: Permission denied
lkocman@lkocman:~/Downloads> cat
/var/run/media/lkocman/ignition/ignition/config.ign 
{
  "ignition": { "version": "3.1.0" },
  "passwd": {
    "users": [
      {
        "name": "root",
        "passwordHash": "O9h4s2UUtAtok"
      }
    ]
  }
}
lkocman@lkocman:~/Downloads> 

Worked fine PermitRootLogin was set to yes, no combustion involved.