Hungary2:

I can confirm this.
In BIAB Win 2021 64(822)

- I open any song, play it, then mute (say) the bass part,
then play it again to ensure that track has been muted

- Then use Shift F8 to go to the next song. It asks if I want to save the existing song and I say No
- When the next song opens, the bass track is NOT muted

Perhaps that's a "new feature" because, when I try the same sequence in BIAB 2020,
no matter how many songs I open, they all have the bass part muted.

Perhaps there's a setting somewhere in 2021 to toggle this on and off.
Someone on here will likely know the answer.

Good luck!
LLOYD S