I did a quick check and confirmed the soloist RT is no different than the other tracks. Once made in BIAB and then opened in the VST they all were able to be dragged over into Reaper.

Opps, but I forgot to use the #1241 Piano, Electric, Soloist SmoothJazzPoppy delay Ev16. Let me try this again with another file.

OK, I did it all over again with the correct RT and no diff. All works fine here. No surprise. crazy BTW, I have V3.4.5 of the BIAB VST

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6