TreeGrid axis does not remove label icons on data update

[pawelfus]

Expected behaviour

After updating data, unnecessary label icons are left.

Actual behaviour

The unnecessary label icons should be removed.

Live demo with steps to reproduce

Wait 2 secs to observe the issue
https://jsfiddle.net/BlackLabel/3Ljoa0he/3/

Product version

Highcharts Gantt v8.1.0+

Workaround

Snippet:

Highcharts['_modules']['Core/Axis/TreeGridTick.js'].Additions.prototype.destroy = function() {
  if (this.labelIcon) {
    this.labelIcon.destroy();
  }
}

Demo: https://jsfiddle.net/BlackLabel/3Ljoa0he/2/

Internal note:
It seems to be a regression after moving TreeGrid into a composition. Previously, all icons used to be removed automatically in Tick.destroy(), which simply goes over all properties in a Tick instance, and if destroy() is available - calls it. Now, with composition, Tick.treeGridTick does not have destroy(), so the property is simply deleted, leaving the icon in DOM. Workaround (and the solution) is to add destroy() to the composition (like above)