Categories in charts (pie, time series, bar, etc.) are hidden/shown when clicking on legend arrows for scrolling which does not work

Categories in charts (pie, time series, bar, etc.) are hidden or shown when clicking on legend scrolling arrows, with the scrolling not working.

1. Open the ITIL Homepage.
2. Look at a pie chart with multiple categories, such that the legend showing the categories can be scrolled. If for example there are 4 pages in the legend, "1/4" can be seen with up and down arrows below the pie.
3. Click on the lowest categories of the chart, the one closest to the arrows, this will be hidden.
4. Click on that same category again, it will be shown again.
5. Click on the down arrow.

Clicking just below the scrolling arrows will change the page in the chart legend.  This applies to both up and down arrow.

Clicking the arrows can result in removing the grouping unexpectedly.