FYI - It seems that Google has decided that they know best and have been hard encoding DNS settings on their more recent updates if you use their Google One VPN. This is beyond BAD!!!
You have to manually go into a Windows (10 or 11) machine and manually reset the network settings!!
In any case be aware (this caught me and took a while to figure out what happened when I returned from a trip abroad).
I deleted Google One VPN from my computer till this is resolved and now using my previous VPN.
However - it was this screen (and the IPv6 version) that Google One had updated with their DNS servers and I had to manually delete and save.