Thank you for the tip on dmesg` because I noticed an error regarding RAID and a bit of homework suggested changing the BIOS to use the AHCI instead. Using AHCI did the trick.
IDK if something in the filesystem changed around 42 or 43 but it was just enough to not be able to treat the single nvme device as RAID. (I noticed the installer defaults to btfs and I think before it was EXT4 (maybe ZFS ?) I don’t have an opinion on filesystems.
Thanks for the Kinoite tip, BTW.