The kernel code is looking for:

1) Each partition has the 1 bit set in its flags byte
2) Each partition's ID bytes are all ascii numbers
3) Each partition starts and ends within the bounds of the disk

When these conditions are met, it sets up the partitions and states that
the partition table type is "AHDI", which your syslog shows, so as
unlikely as this seems, it must have happened.

I suppose you can get a hex dump of the boot sector of this drive and
see:

sudo dd if=/dev/sda count=1 | hd > bootsect.txt


** Changed in: util-linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1531404

Title:
  nonexistent partition in /dev, & lsblk/disk util misbehaving with
  randomized disks

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