As far as I can tell, `guix import hackage` imports the first revision of a hackage release.
I suggest aiming to import the latest cabal revision from hackage, as already supported by haskell-build-system via the #:cabal-version argument. In the meantime, documenting this in the `guix import hackage` documentation would be much appreciated, it took me quite a long time to figure out what was going wrong here.
