Rounded corners on stacked bar chart

Any chance to see this working on stacked bar charts? Currently the rounded corners are applied to the bottom bar as well. There should be a rule to apply the rounded corners only for the top bar if there are more that 1 bar on top of each other.

Start by reproducing the reported behavior with a stacked bar chart and inspect the rounded-corner logic. The change is done when corners are applied only to the top bar in a stack, while the existing behavior for non-stacked bars remains correct.

Written by the indexing model from the issue text.