While we wait to see what is wrong with your Output-Chords.

Here is a old work around (so many of these in biab). Put this style on your chord chart. This will create a midi track with just a piano. These chords may be triads from the root. But will be a simple non embellished single chord midi track which you can drag and drop from BIAB to your DAW. It may be what you can use.

PNOSIMP4.STY. Simple Solo Piano 4/4 Style
All MIDI. Duo. Tempo=120 (60-180)
Instruments: M-Ac.Piano
Memo: This style will emulate simple Solo Piano playing in 4/4 tempo. Tempo range 50-200 -Examples: Wedding March, and most tunes in 4/4, Genre "Intensity" Score=30/100

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