cellNav causes draggable rows functionality to not work

I know this issue is in relation to a third party plugin but I wanted to ask in case this had something to do with the way cellNav is modifying the grid.

The issue is this: if cellNav and ui-grid-draggable-rows are both enabled on the grid, draggable rows will not work. The strange part is however, if edit is enabled and a cell is focused for editing, then the draggable rows directive will work.

Here is a jsbin describing the issue: https://jsbin.com/nomixu/edit?html,js,output