Docker "data-root" in a tmpfs directory raises "failed to solve"

[simon-liebehenschel]

Setup 1

• Fedora 38

• ~/.config/docker/daemon.json content:

{
  "data-root": "/tmp/docker-data"
}

where /tmp is tmpfs.

Setup 2

Using https://wiki.archlinux.org/title/Anything-sync-daemon to store /home/sam/.local/share/docker/volumes in tmpfs and auto-backup file to a disk.

Command

docker compose up

Error

failed to solve: failed to compute cache key: failed to apply diffs: 1 error occurred:
	* failed to handle changes: failed to retrieve user.overlay.opaque attr: operation not supported

Question

What exactly goes wrong when a folder is on tmpfs? Are there any things I am missing our to make Docker working?