We can't look under the bonnet of BIAB to see exactly how it's programmed musically.

You can't create all those chords you can enter into BIAB with the C major scale, can you?

All the chords are audible, but not with the correct notes, because there is an example in the picture of four bars that have different chord symbols but show the same notes in the chord.

You also have this situation in Cubase.
I do not know the answer to this.