I have had an issue of the same thing being generated for one or more bars and in that case they add together instead of sounding like two separate guitars.
I was wondering about that.
I'm guessing BIAB has ways to micro-tweak audio so that even though *THIS* 2-bar recording is the same as *THAT* 2-bar recording, such multiple instances won't (or shouldn't) be perfectly aligned and identical, and can double one another.