Hey there, this is not a bug, there are multiple undo commands on the Aeros
The one you are using is only able to undo the top layer of an existing track
You can find all supported commands here
Check out these commands for more versatile use:
| CC:37 Undo / Redo | Command | Value | Behavior |
|---|---|---|---|
| Undo/Redo Selected (Top layer) | 0 | Undo/Redo currently selected track’s top layer (6x6 mode) | |
| Undo/Redo Track (Top layer) | 1-6 | Undo/Redo track’s top layer (track # = value #) | |
| Undo Track 1 | 11 | Undo the top layer of track 1 | |
| Undo Track 2 | 12 | Undo the top layer of track 2 | |
| Undo Track 3 | 13 | Undo the top layer of track 3 | |
| Undo Track 4 | 14 | Undo the top layer of track 4 | |
| Undo Track 5 | 15 | Undo the top layer of track 5 | |
| Undo Track 6 | 16 | Undo the top layer of track 6 | |
| Redo Track 1 | 21 | Redo the top layer of track 1 | |
| Redo Track 2 | 22 | Redo the top layer of track 2 | |
| Redo Track 3 | 23 | Redo the top layer of track 3 | |
| Redo Track 4 | 24 | Redo the top layer of track 4 | |
| Redo Track 5 | 25 | Redo the top layer of track 5 | |
| Redo Track 6 | 26 | Redo the top layer of track 6 | |
| Undo/Redo All Layers Track 1 Toggle | 101 | Toggle between Redoing or Undoing All Layers of Track 1 | |
| Undo/Redo All Layers Track 2 Toggle | 102 | Toggle between Redoing or Undoing All Layers of Track 2 | |
| Undo/Redo All Layers Track 3 Toggle | 103 | Toggle between Redoing or Undoing All Layers of Track 3 | |
| Undo/Redo All Layers Track 4 Toggle | 104 | Toggle between Redoing or Undoing All Layers of Track 4 | |
| Undo/Redo All Layers Track 5 Toggle | 105 | Toggle between Redoing or Undoing All Layers of Track 5 | |
| Undo/Redo All Layers Track 6 Toggle | 106 | Toggle between Redoing or Undoing All Layers of Track 6 | |
| Undo All Layers Track 1 | 111 | Undo all layers of track 1 | |
| Undo All Layers Track 2 | 112 | Undo all layers of track 2 | |
| Undo All Layers Track 3 | 113 | Undo all layers of track 3 | |
| Undo All Layers Track 4 | 114 | Undo all layers of track 4 | |
| Undo All Layers Track 5 | 115 | Undo all layers of track 5 | |
| Undo All Layers Track 6 | 116 | Undo all layers of track 6 | |
| Redo all Layers track 1 | 121 | Redo all layers of track 1 | |
| Redo all Layers track 2 | 122 | Redo all layers of track 2 | |
| Redo all Layers track 3 | 123 | Redo all layers of track 3 | |
| Redo all Layers track 4 | 124 | Redo all layers of track 4 | |
| Redo all Layers track 5 | 125 | Redo all layers of track 5 | |
| Redo all Layers track 6 | 126 | Redo all layers of track 6 |
Thanks for the question!