Switching between Note On/Off in either Samples or Keyzones causes it to deselect what you were previously working on. It should remember what was selected.
This indeed would be a nice thing to have, but it’s not really a “malfunction” and unfortunately also not really easy to realize (in detail - hard to explain why).
Let me please move this from the bug reporting queue to the nice to have features queue.
Will try to take care of this when there’s time…