It sounded like a demo version or an early mix. Sometimes, when an album is on the way, but not quick enough for the purposes of promoting a film soundtrack, they'll use an earlier version. The version of "Always Forerver Now" on the soundtrack for the Pacino/De Niro/Michael Mann film HEAT is an incomplete version, missing the soaring ascending strings that make the track so exhilarating on the Passengers album.
(Likewise, the closing track, Moby's "God Moving Over the Face of the Waters"; the film features the complete version over the end credits, while the version on the soundtrack album is actually missing its sweeping chorus.)
Bringing it back to Wenders' film, though, there are songs not included on the soundtrack album that are in the film, including a version of Peter Gabriel's "Blood of Eden" that is extremely raw, very different from the version on the Us album, released a year later. It's interesting with soundtrack contributions, because these are artists who generally don't want people to hear their songs until they have them exactly as they want them. But, they're also artists who are eager to contribute to the work of certain film-makers, and probably don't want to miss those kinds of opportunities.
