It seems to be a design limitation rather than a pure bug but let me report it. I am using headphones at the moment of writing by the way.
- Load a stereo sample on pad A8
- Go to pan. F7 on 7 (=hard pan)
- Back to main screen then shift+A8
- Click on Assign sound
- Browse files.
→ It only sounds on the hard-pan channel and not on two channels.
I wish it could play on channel 7 and 8, rather than channel 7 or 8 only.