The Ext.chart.series.Pie3D.getItemForPoint() method overrides Ext.chart.series.Series.getItemForPoint(). Yet, this is not reflected in Ext JS 7.1.0 documentation on Ext.chart.series.Pie3D.getItemForPoint().

I believe the problem is there just because no JSDoc comments were added just above the Ext.chart.series.Pie3D.getItemForPoint() method definition.