As mentioned, when I believe it was town rank that triggered the Savannah to be open which was a few days ago(real life), I could be wrong and it might of been something else that opened it. All I remember is getting the dialogue saying the Savannah is open. Recently I offered some stuff to the shrine and got the cutscene of the bridge being created which was already there. As of right now its just a wrong order for the story, nothing major.
Steam
v1.1b-1236
Controller/Keyboard
Unsure if can be replicated
