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[NiKiZe]

qemu comes with an iPXE rom.
you can chain to a newer version of iPXE, but your issue is that your distro don't update packages.
I will try to be clearer - do build a new ipxe ROM for qemu from the latest sources.
When you start qemu, use the options to provide the path to your new ipxe rom - which is an option that you can provide on the cmd line, or as option in libvirt if that is what you are using.

You should also file a bug report, and tell your distro to upgrade to recent iPXE - and make sure it works as you described in your usecase (it's probably not tested much with 2 nics)