Possible bug report for @scanner_darkly.
Record two simple patterns in both slots one and two.
Enter pattern select mode.
Activate pattern 2. All good.
Then activate pattern 1.
No gates seem to be sent for pattern 1.
Going back to pattern 2, gates appear AOK.
Exiting pattern select mode seems to make things ok again.
Might be operator error. Will fiddle more today.
UPDATE : it appears to be some kind of “stuck note” issue. If you switch patterns at the exact time a particular note is playing, that note appears to get stuck on, effectively taking voice priority, pushing notes in the new pattern to the next voice … if that makes sense.