Final Fantasy 7 Rebirth continues right where FF7 Remake left off with Cloud and his group having left Midgar. At least, in the main timeline, that's where the group starts off in this section of the trilogy. But with the existence of multiple timelines, and more being created with even the smallest choices, the story can get a bit confusing, especially when it looks like some characters have varying levels of awareness of those alternate timelines.

https://screenrant.com/ff7-rebirth-alternate-timelines-characters/