Reminds me of the alternate, feature-length version of the Twin Peaks pilot, created in case the series was not picked up, in which they continue the storyline set up in the first hour, and resolve the murder mystery by the end. Widely available on home video formats. (Do NOT watch this version if you intend to watch the entire series!)
That's a great example of the same kind of accidental branching timeline
It aired on TV in some European countries, because at the time the actual series had not been picked up there. So for who-knows-how-many people, the alternate pilot was the only version of Twin Peaks they were ever aware of.