Steps to reproduce: 1. set set+scrollwheel to timelapse play in preview mode, 2. enter preview, start the feature, 3. without stopping sequence, press some mode-changing button (like Menu or Trash). 4. observe a few bogus 'keystrokes' that happen.
When Menu button is pressed, it catches a few left/right events that should not happen. When Trash is pressed when playing in the right direction, one cannot Cancel the operation, as Erase button is immediately highlighted.
It seems like this feature emits too much movement actions to be captured and handled before Canon firmware gets into the front. Is it throttled anyway? I guess this needs some moderation to throw 'next image' only when previous one is already loaded, otherwise depending on hw/card speed and keystroke buffer weird and dangerous things might happen.