You are using Utility Tracks, and I don't think RB fully supports those yet, and to be honest will likely always be behind BiaB on these.

Reason: they are developed for BiaB (RB doesn't need them as it already has extra tracks to generate on)
So RB will likely always be behind in the use of Utility Tracks

If it were me, I'd adjust my workflow (as many here have) and simply move to RB sooner.

Instead of generating Utility tracks in BiaB, get the basic SGU file down in BiaB and then generate additional tracks in RB, instead of using Utility Tracks.
This is only applicable if you know you are going to eventually move to RB, but if that is the workflow, just switch to RB before turning to Utility Tracks in BiaB.
Then all your additional tracks will remain as intended.
Just a suggestion from a long time user.

FWIW, I get the basic stuff down in Biab when I use it (Tempo, Chords, Style, etc.), then move to RB as soon as I can where I can refine and generate additional tracks without this snafu.

I do not work here, but the benefits are still awesome
Make your sound your own!