The OCI layers that we generated have hardlinked files duplicated:

https://github.com/ostreedev/ostree/issues/2925

Since the files will be deduplicated when imported into the local Flatpak ostree repository, this doesn't have any affect once the Flatpak has been installed, but it makes the download much bigger and processing much slower: it bloats the Fedora Flatpak runtime from 712M => 1345M.

We could add a post-processing step to untar the layers, run hardlink on them, retar them, and fix up all the checksums, but almost certainly better to just fix this in ostree.