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What is consuming 12 GB of disk space?

I pruned all images, containers and the build cache, leaving only couple of small volumes. The system shows that everything is cleared:

% docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          0         0         0B        0B
Containers      0         0         0B        0B
Local Volumes   2         0         134.1MB   134.1MB (100%)
Build Cache     0         0         0B        0B

Still, the Docker Preferences pane shows that 12.5 GB of disk space are still occupied:

The space is taken by /Users/Vladimir.Ryabtsev/Library/Containers/com.docker.docker/Data/vms/0/data/Docker.raw. I don’t remember if it was like that right after the installation. Is is the space consumed by the Docker system itself? The name is a bit misleading then, as it makes me thing this space is occupied by images.