vfscanf()

That’s normal. On BIOS systems the stage 1 bootloader (which is what this command installs) is always i386, see https://wiki.archlinux.org/title/GRUB#Installation_2 .

What surprises me is that the installer runs in BIOS mode, because your system should be recent enough to use EFI. When you boot into the installer, you should make sure to select the boot entry that has EFI in its name. That might be the problem, but without seeing the output of grub-install, it’s hard to tell.

I use k3b for ripping and kid3 for editing metadata

I also use Rhythmbox, the UI is clean and simple. Other music players either are too complicated (UI has too much clutter, play queues) or want to automatically import all audio files in my home directory into the library, which is annoying. But to be fair, I haven’t tried a lot of other players, because I’m happy using Rhythmbox.