This behavior can be used to your advantage if you build the solo in a DAW. One of the issues I have always had with the generation of real track solos is that they tend repeat quit a bit and can limit the phrases available based on the chord progression during the solo.

I usually will generate about 8 real tracks and save each to a separate track in the DAW. I then save my original BIAB song and create a new version to work with. I then manipulate the song structure, key, or chord progression that compliments the original to force BIAB to regenerate completely new real track solos. At this point I'm only interested in the solo so it doesn't matter what the rest of the instruments sound like.

Move those regenerated tracks into the daw and you have completely new phrases that would have never been generated following the original score. It's a lot of work cutting and pasting the custom solo and takes time but worth it to get some completely original phrasing.

Of course you can't do this if your just creating a BIAB piece but you do have the option of moving the completed solo track from the DAW back into BIAB by inserting it as an audio track although I have never done this. I use BIAB for just composing and generating real tracks.