Console issue on core snap with bridge

[Davide Ronchi]

I set up Ubuntu Core with a network bridge, everything works fine, but the console shows:
Ubuntu Core 16 on <no ip address> (tty1)

You cannot log in until the system has an IP address.
(Is there supposed to be a DHCP server running on your network?)

This is not true, as I can happily ssh into the box.

Every 5-10 seconds, the message disappears, some python runs on the box spinning up the CPU quite a bit, and then the message reappears.

The bridge is set up in netplan like so:
network:
  ethernets:
    eth0: {}
  bridges:
    br0:
      addresses: [192.168.0.11/22]
      gateway4: 192.168.0.1
      nameservers:
        addresses: [192.168.0.1]
        search: []
      interfaces:
        - eth0
  version: 2

[Davide Ronchi (idave)]

2 more notes:
1. The message reported appears on UC 18 (despite it saying UC 16)
2. The issue is still present in UC 22, but it doesn't hammer the CPU as much as it does on UC18