I ran qemu (in cosmic) with a cloud image and

 -device virtio-net-pci,netdev=mynet,mac=$mymac -netdev user,id=mynet

and loaded the ofnet module. I then listed the network cards and the mac
address was correctly recognized.

I have not figured out how to PXE boot it yet, so net_default_mac was
empty.

But this experience leads me to believe that there are multiple
interfaces and it might be looking at the wrong one. There does not seem
to be any code in grub to generate random mac addresses.

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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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