It's was meant to be intentional. Why do you think the SJ editors published it we they knew it was deliberately? It's part of a ploy to not to spoil the main four pairings before the movie airs in Japan.
I just have a really hard time believing the IT theory
Expect that for Hinata… After all, that “sayonara Naruto-kun” portion wouldn’t be there for nothing, right? xD
If the spoilers are to be believed, Hinata rejects Naruto's confession and goes with Toneri. Maybe she says 'Sayonara' during this scene?