score:1
Accepted answer
As you can see in the Highcharts Gantt source code: https://github.com/highcharts/highcharts/blob/47dfb49f7b6053178c92d24b34b5f3e7ddd8770b/ts/Series/Gantt/GanttSeries.ts#L202
shape for milestone can not be set through API options.
The simplest solution is to replace diamond function with the built in triangle function.
(function(H) {
H.Renderer.prototype.symbols.diamond = H.Renderer.prototype.symbols.triangle
})(Highcharts);
Live demo: https://jsfiddle.net/BlackLabel/9zuodLjt/
Docs: https://www.highcharts.com/docs/extending-highcharts/extending-highcharts
Source: stackoverflow.com
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