reproduced on our dogfood instance.

One of our 3 replicas is no longer receiving peer and tunnel updates, so if your agent or client connects to that coordinator, it will fail to set up networking. I can see this via debug logging: 2 of 3 coordinators show peer and tunnel updates but the 3rd coordinator drops no logs about getting updates.

When I connected from a client and landed on the bad coordinator, my client never got the agent node update, but the agent, connected to a "good" coordinator did.