onDragStartEvent does not include button initiating the drag, so both right and left mouse drag have the same behavior

[buffos]

I am trying to implement both move piece dragging and drawing arrows on the board. Everything works except when a piece is moving.
It initiates onDragStart and there is no way to stop it. Checking which button iniitates the drag is not possible since it is not included in the event

Can you please include the event.button which initiates the drag, so we can filter it out?