Unexpected behavior of `mount_filesystems` on 14.0 (n71map)

[nick-botticelli]

On 14.0 host and 14.0 ramdisk, I get the following error(s) when running mount_filesystems:

seputil: Gigalocker file (/mnt7/83308556-0035-534F-953A-8E596A5BC07E.gl) exists
seputil: Gigalocker initialization completed
seputil: can't open '/mnt1/usr/standalone/firmware/sep-firmware.img4', errno: No such file or directory(2)
seputil: rejecting zero-byte firmware
seputil: failed to load /mnt1/usr/standalone/firmware/sep-firmware.img4 in  mode
mount_apfs: volume could not be mounted: Resource busy

As the error suggests, sep-firmware.img4 is not located in /mnt1

When instead running mount_apfs -R /dev/disk0s1s6 /mnt6, sep-firmware.img4 appears in /mnt6/usr/standalone/firmware/sep-firmware.img4.

After initializing gigalocker, /usr/libexec/seputil --load then panics the device (though this is not my concern).