Okay, this is a weirdness caused by how I installed this laptop. I did a
standard Debian install in 2021, then copied the rootfs from my previous
(non-EFI) machine over it.
Therefore I ended up with the modules in /usr/lib/grub/x86_64-efi in
place, but not part of any installed Debian package.
This is probably related to
http://git.savannah.gnu.org/cgit/grub.git/commit/?id=26031d3b101648352e4e427f04bf69d320088e77
- if the config change from that commit is combined with an older grub2
binary, the binary will interpret `fwsetup --is-supported` as `fwsetup`
and immediately reboot into the
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