Maybe you could try with the menual chroot procedure, as opposed to the button.
Probably you’ll have to first decrypt the drive and use /dev/nvme1n1p2_crypt insead of /dev/nvme0n1p2 (or try sudo mount /dev/mapper/crypto_LUKS /mnt/broken) , while the EFI system partition should be /dev/nvme1n1p1 insead of /dev/nvme0n1p4.