Graph Drilldown Not Supported When Grouped By {Day,Week,Month,Etc.} Of Year

When grouping a graph by day or week or whatever of year and wanting to drill down by clicking on the graph, Workfront throws out an error message saying that drilldown is not supported when these groupings are picked.

While some may argue that this is a feature request, I think this is a bug as it is very inconsistent to not support drilldown just because this grouping is chosen. The data is absolutely the same, just the representation is different (e.g. "week 6" instead of "February whatever"). There should be no reason why the drilldown should not work in this instance.