Thanks for all of the tips and hints.
However, the two fundamental questions haven't been answered and I believe this is because it is a bug. This was not the behavior of previous versions.

When opening an SGU in RB, the bar settings aren't retained. Chord settings are retained.

When the tracks open they are not brought in as BiaB tracks, They appear below the 8 BiaB track slots.

Can anyone confirm this behavior in RB 2018?

So, should I file this as a bug report?


Band-in-a-Box PlusPAK Upgrade (2018) on Windows 10
Live instruments: Schecter Solo-6 Custom, Fender Mustang III v2.