Why does my partitioned volume return lost+found

I am trying to understand why my attempts to mount DO’s block storage device to docker’s /var/lib/docker dir results in lost+found.

First, Terraform is used to provision a digital ocean droplet and attach a volume to it. Then ansible is used to configure the host.

Please note that playbook below is using static/explicit values due to needing to debug:

---
- name: mount point of attached volume 
  stat: 
    path: /mnt/name_of_attached_volume

- name: get digital_ocean_volume_path_by_name 
  stat:
    path: /dev/disk/by-id/scsi-0DO_Volume_name_of_attached_volume

- name: unmount images volume
  command: umount /mnt/name_of_attached_volume


- name: Label the volume
  command: parted -s /dev/disk/by-id/scsi-0DO_Volume_name_of_attached_volume mklabel gpt

- name: Create an ext4 partition
  command: parted -s -a opt /dev/disk/by-id/scsi-0DO_Volume__name_of_attached_volume mkpart primary ext4 0% 100%

- name: Build the ext4 metadata
  command: mkfs.ext4 /dev/disk/by-id/scsi-0DO_Volume__name_of_attached_volume-part1

####################################################################
#  since the mount point  -- `/var/lib/docker`  -- already exists  #
#  by virtue of docker being installed on the host, no need to     #
#  create a mount point but I do need stop docker running          #
####################################################################

- name: stop docker service 
  service: 
    name: docker 
    state: stopped

- name: mount volume read-write
  mount:
    path: /var/lib/docker
    src: /dev/disk/by-id/scsi-0DO_Volume__name_of_attached_volume-part1
    fstype: ext4 
    opts: defaults,discard
    dump: 0
    passno: 2
    state: mounted

- name: remove mount point for images volume 
  command: rmdir /mnt/name_of_attached_volume

- name: Start docker service 
  service: 
    name: docker
    state: started
    enabled: "{{ docker_service_enabled }}"

After running the playbook above, the result of for running ls -la /var/lib/docker is:

drwxr-xr-x  3 root root  4096 
drwx--x--x 14 root root  4096
drwx------  2 root root 16384 Jan 25 16:47 lost+found

**Why is this so? ** I do not believe that the directory should be lost+found.

I am obviously missing/misunderstanding a step. Greatly appreciate tips please. Thank you!