I am running Technitium DNS Server and of course I want to control all my outgoing DNS requests. Adding 8.8.8.8 to /etc/resolv.conf does counteract that.
I checked the code when the system was built, and the dns settings for /etc/resolv.conf should have been created by Networkmanager.
8.8.8.8 is specified by the system when creating a Thunderbolt network bridge. Maybe that’s what led to the problem you said.
I’ll re-investigate it, and if it doesn’t affect me I’ll remove it in the next release.