'Inspecting a Docker BuildKit cache on registry

The docker buildx build command accepts an option --cache-to type=registry,ref=my/repo:buildcache that pushes the build cache to the registry (some docs).

How can this cache be inspected?

docker buildx imagetools inspect my/repo:buildcache crashes from a null pointer dereference.
docker manifest inspect my/repo:buildcache triggers a 500 Internal Server Error.
The Docker Hub website provides no information about a tag for a pushed build cache, except that it exists.

If I run a build with the symmetric --cache-from type=registry,ref=my/repo:buildcache option, it does print importing cache manifest from my/repo:buildcache but I don't know what it has imported.

docker

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'Inspecting a Docker BuildKit cache on registry

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