hello user34150,
since you’re enabling disk encryption, it has an unique ECID, which means it generates per-device encrypted disk images for disk encryption.
although it’s now able to create encrypted images with a generic key, it’s backup/restore script limitation with ROOTFS_ENC devices.
it must to run flash script (from host machine) to deploy devices with disk encryption for using a generic key.
please see-also.. Topic 333135, Topic 291335.