@pine1needle I am using a mouse. I think if you tested it with a mouse (not a MagicMouse) you would have the same issue, but I am not sure. I would love to hear if you still do not have the problem while using a mouse.
@robbage I just tested it with and without touchscreen mode enabled and the problem still exists while using both options
I want this thread to stay alive, because the issue still exists:
I think the fix to this would be to add an option where both horizontal and vertical scrolling are recognized by Minecraft as vertical scrolling in the mouse control settings in game. Or to have the game recognize any scrolling (including horizontal) as vertical, because horizontal is never used anywhere else is the game as far as I know. If this isn't true please let me know.