I didn't say it was resolved, I said it's about a piece of software which is called "resolved" which is one of many programs belonging to "systemd". It's a program which handles DHCP and DNS I believe.

And systemd is part of some Linux distros, yes. But not all. And Linux, the kernel, is agnostic towards IPv4 vs. IPv6 as far as I know.

So saying "Linux prefers IPv4 DNS" and linking to a github issue about "resolved" doesn't make much sense.