This worked for me as well. Thank you!
Previously, when I had the WireGuard issue, I turned off Unraid for the night; but few days later, I came back to boot the Unraid machine; and I noticed this on console startup:
------
I suspect some bad network config was persisted during my previous shutdown.
I was able to get WebUI working temporairly enough to get to the Settings > Network tab; and I did the following:
1. Unbonded the NICs; gave everything separate IPs
--- NIC/eth0 is the only port connected to LAN
--- NIC/eth1 was never really bonded at the begining (i dont recall, I left this network config as-is after fresh install); and also eth1 was never connected to LAN
--- applied settings
2. Rebonded the NICs; this time explicitly specifying eth0 + eth1
--- applied settings
3. This seemed to work.
and now I don't have the console startup error anymore:
--- Only thing I get now is RTNETLINK `Operation not supported` .... but that's fine by me. =)
Also, now I can confirm WireGuard is working (and no manual edits are necessary).