unable to change icon of directory

[Marckov]

Code:

"menu_class": [
        {
            "key": "/ventoy",
            "class": "antivirus"
        },
        {
            "dir": "/ventoy/HDD Tools",
            "class": "gparted"
        }

I have a "gparted.png" under icons directory of theme, but still I'm unable to display icon

Additional information:

   

   

I see that class didn't change and uses the folder's default class