See https://lava.automotivelinux.org/scheduler/job/1171
So, IIUC, the systemd test will fail if both network interfaces are connected to the same LAN?
And, the disconnecting the 2nd interface makes things work again?
If that's the case, then this is now fixed in lab-baylibre and this can be closed.
I didnt saw that the mmc problem was on your DUT. Anyway the data have disappear so I cannot rerun the same job.
How did you generated it ?
See https://lava.automotivelinux.org/scheduler/job/1171