[WGH_]

> it is likely rearranged by systemd, therefore only non-systemd glibc distributions are affected.

systemd doesn't imply installed and running systemd-resolved though. I believe it's usually not enabled by default.

[zinekeller]

> I believe it's usually not enabled by default.

Just verify modern OSes now, they definitely do mediate via systemd-resolver (including in server OSes).