Doubled icons when kendoGridAddCommand

[Robert]

When I would like to use icon in button like this:

<button kendoButton icon="gear" class="k-button" [disabled]="someMethod()"></button>

everything is ok. I see gear icon into a button.

If I would like to use directive kendoGridAddCommand like below:

<button kendoButton icon="gear" class="k-button" kendoGridAddCommand [disabled]="someMethod()"></button>

I see two icons into the button. What is going on? I cannot understand what's adding second icon.

Without directive:

With: