Range type chart annotation

I have a history annotation that I have added via a script. I have the type set to range, and a distinct start and end time for the annotation. However, when I look at the annotation in the power chart, it doesn't look any different than a note or a marker? I assumed that the range type would highlight a range of the history? Is this an incorrect assumption? Or is there an issue with annotation types.
See attached screenshots

rangeAnnotation