When snap rolled lxd to 4.0 earlier today (stable), all of my containers lost their ip addresses. I couldn’t get any container to regain an ip, setting an ip didn’t work, rebooting the container, creating a new container- All of these failed. lxc list showed all containers just didnt have ips!
Rebooting the host restored my setup. Hoping this post will help another admin figure out the solution!