The export is MIDI files. I then import those MIDI files into Guitar Pro (which is at the botttom of the screenshot).

In the Guitar Pro import screen one gets lost when one tries to track back which of the BIAB lanes (tracks) is what.
Look at the Vocals from BIAB.
The rendered audio file is named OK.

Bit when I import the MIDI then there is no lane (track) named "Vocals".
It is called "Melody BB" and the patch is "Vibraphone".

I would exspect that BIAB names the corresponding MIDI track "Vocals" too and the patch "Voice Oohs" or "Lead, Voice".