Persistent device names

I was going to say that if you change the NIC, it's not going to be the same physical port anymore
and the system is correct not to make any assumptions about which NIC replaces which.
If the MAC addresses are all it has, that is.
A pedant might argue that a VM NIC doesn't have a physical port to begin with. ;)

But yeah, that's a valid case, though it can probably be fixed with a quick run through the virtual
console, and/or automated with a script. (brute force solution: nuke the saved MACs and reboot)