Steps to Reproduce

1. Load a pie chart: https://www.zkoss.org/zkchartsdemo/pie_basic
2. Click on a slice
3. While the animation is playing, click on another slice

Current Result

both slices (fat, water) stay highlighted

Expected Result

try https://www.highcharts.com/docs/chart-and-series-types/pie-chart
only the selected slice is highlighted (default behavior on non-zk highcharts of the same version)

Debug Information

In Charts.js, in the static hidden block

H.wrap(H.Point.prototype, 'select', function (select, selected, accumulate, fromServer) {

This overrides the default Highcharts.Point.prototype.select function.
Current override version is based on an older highcharts version, which is no longer matching the current highcharts version of this function.

Workaround