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Operating system is:

root@k3s-worker-2:/home/worker# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.5 LTS
Release:        22.04
Codename:       jammy

it's running in a VM under ProxMox.

It's not ignoring your server address. that's the address of the local loadbalancer that sits in front of all the servers, including the one you initially specify. Make sure you can actually curl the server address from that node. You can add --debug if you want to see the logs from the attempts to connect to the servers.

Ah! I see; so it's failing to get from the upstream not the local. Okay, that makes a ton more sense.