This is the culprit:

https://git.savannah.gnu.org/cgit/grub.git/commit/grub-
core/net?id=9585647a25b65f98db6bd22c569b34795512f046

Removing the parser for bootpath gets rid of the broken additional
interface. I expect that checking the return value of
grub_ieee1275_get_property() when querying the mac also fixes it, and
will investigate that shortly (as it seems the bootpath contains IP
addresses, but not MAC addresses).

** Changed in: grub2 (Ubuntu)
       Status: Triaged => In Progress

** Changed in: grub2 (Ubuntu)
     Assignee: (unassigned) => Julian Andres Klode (juliank)

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https://bugs.launchpad.net/bugs/1785859

Title:
  [REGRESSION] ppc64el grub in bionic may be auto-generating MAC address
  instead of using the assigned to the VM.

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