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.
h.renderer.prototype.symbols.diamond = h.renderer.prototype.symbols.triangle
live demo: https://jsfiddle.net/blacklabel/9zuodljt/
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