Grub unknown filesystem/can't chroot after installing Windows 11

[sliding_billy]

[root@archiso liveuser]# ls -l /mnt
total 0
drwxr-xr-x 1 root root 130 Jun 1 13:09 @
drwxr-xr-x 1 root root 210 Jun 27 14:00 timeshift-btrfs