I think I misunderstood you. The one I was talking about was a bug in proxmox. If it’s an issues inside lxc, you can replicate the Ubuntu networking stack using nmcli or use systemd-networkd and resolved directly. It behaves identically as far as I know.
Try to not be reactive. Take appropriate action whenever needed but choose to act after a delay so that you aren’t responding impulsively. In my experience 90% of conversations that were problematic could have been avoided if either party chose to walk away or take a break.