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I used standard docker cleanup commands but still docker occupies huge disk space while it reports low disk usage.

I upgraded docker-ce to latest version (5:23.0.5-1~debian.11~bullseye) then issued the following commands to reclaim docker disk space:

service docker restart
docker stop $(docker ps -a -q)
docker system prune -f --all --volumes
docker buildx prune -f --all
but still docker overlay storage uses huge disk space:
du -sh /var/lib/docker/overlay2
105G    /var/lib/docker/overlay2
while it reports low disk space usage:
docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          0         0         0B        0B
Containers      0         0         0B        0B
Local Volumes   3         0         1.368GB   1.368GB (100%)
Build Cache     0         0         0B        0B
Then what can I do to free disk space?
Update:
I found a open issue about this problem: https://github.com/docker/for-linux/issues/1423
                If you're at a "delete everything" step already, it would be safe to stop the Docker daemon and delete the entire /var/lib/docker directory, then restart Docker.
– David Maze
                Apr 27 at 10:14
                no, I need some of the containers and volumes, but I executed some destructive cleanup to show the problem
– zxsimba
                Apr 30 at 5:15