LUKS2: argon2id

[mithrial]

GRUB2 doesn’t support argon2id.

LUKS boot disk not unlocking at boot, but from live disk

Ah yes, right, this is it: From your linked post: Also, if you’re using an encrypted /boot, stop now - very recent versions of grub2 support LUKS2, but they don’t support argon2id, and this will render your system unbootable. (It works with the systemd-hooks and systemd-boot.)

https://wiki.archlinux.org/title/GRUB#LUKS2