Non-existent domain for external addresses

services:
  pihole:
    container_name: pihole
    image: pihole/pihole:latest
    # For DHCP it is recommended to remove these ports and instead add: network_mode: "host"
    network_mode: host
    environment:
      TZ: 'Europe/London'
    volumes:
      - './etc-pihole:/etc/pihole'
      # I have one local.conf file in there which pushes out a second DNS to avoid the
      #  android sticking 8.8.8.8 in as a backup problem (see link below)
      - './etc-dnsmasq.d:/etc/dnsmasq.d' 
      - './backups-tmp:/backup'
    cap_add:
      - NET_ADMIN # Required if you are using Pi-hole as your DHCP server, else not needed
    restart: unless-stopped

Thanks. But I should also note that the exact same effect is achieved on a scripted vanilla install in a proxmox lxc in testing.

The android 8.8.8.8 issue.