UI Grid with infinite scroll and tree view option

Hi, We are working with the latest version of ui-grid 4.6.2.

We use the grid to display a tree view with infinite scroll to load more data. The loading data and the hierarchical view is fine. But a bug occurs with the grouping button "+" when we scroll on the current page with the grid scroll bar. a button "+" is appears on the grid left side where no node of the tree is available. To reproduce we use the scroll bar on the grid. With the scroll mouse event that works fine.