@atzanteol LVM is inside LUKS. For some reason, resizing stops even though I unmounted the partition it is still being marked as "active". I disabled my SDDM and everything, rebooted, and still couldn't do it.
my reaction was "well... maybe there's something else holding this, LUKS maybe?"
It never occurred to me to attempt such a thing. I'd first try on a throwaway VM and virtual disk I guess. But resizing is already sort of a bad vibe. I'm trying to move towards being able to do full reinstalls more smoothly. That's still a work in progress though.