Issue with Pie Chart Legend Resetting on Data Source Update #162

Hello,

I am experiencing an issue with the pie chart's legend in my project. When I apply a filter and then trigger a data source update while the filter is active, the legend loses its state and resets as if no filter were applied.

I've created a StackBlitz example to demonstrate the problem.

Interestingly, this issue does not occur with the line charts that also have legends, leading me to believe it might be specific to the pie chart implementation.

Could you please advise if it would be possible to maintain the legend state during a data source update?

Thank you very much for your assistance!