I regenerated the song many times and most of the time I got something like this:

Measure 20 = G# - The notes that are being played from the highest to the lowest note are G#-D-C#-G#-G#

Measure 21 = C#m - The notes that are being played from the highest to the lowest note are E-C#-G#-C#

As you can see the only difference between the two chords is two notes; The G# chord has a D while the C#m has an E.

Personally I heard that difference in each generation even though sometimes some notes were eliminated, usually in the C#m. You might want to regenerate a few times until you get what you want to hear.

I arrived early to a restaurant.
The manager asks, "do you mind waiting a bit?"
I said no.
"Good", he said. "Take these drinks to table 3"

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware