First thing I would try is 'Track - Make all BB tracks regular tracks'.
I don't remember 2014 having this issue, but if you make all BiaB tracks regular tracks, and then Save As a SEQ file, it should behave normally after that (I would think).

Maybe back in 2014 RB honored the SGU file format style unless this change was made, though I don't remember it being like that.
Like I said, just a guess but that's what I'd try.
The caveat is that RB will then only generate the track/section that is selected, which is what I prefer anyway in RB.
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