[Bacardi]

In default gamemodes.txt there seems two single map group of dust2

so try either mapgroup
"mg_dust247"
"mg_de_dust2"

		"mg_dust247"
		{
			"imagename"		"map-dust2-overall"
			"nameID"		"#SFUI_Map_de_dust2"
			"tooltipID"		"#SFUI_MapGroup_Tooltip_Desc_Dust247"
			"name"			"mg_dust247"
            		"grouptype"     "reserves"
			"icon_image_path"  		"map_icons/map_icon_de_dust2"
			"maps"
			{
				"de_dust2"		""
			}
		}

		"mg_de_dust2"
		{
			"imagename"		"map-dust2-overall"
			"nameID"		"#SFUI_Map_de_dust2"
			"tooltipID"		"#SFUI_MapGroup_Tooltip_Desc_Dust2"
			"name"			"mg_de_dust2"
			"icontag"		"bomb"
            "grouptype"     "reserves"
			"icon_image_path"  		"map_icons/map_icon_de_dust2"
			"maps"
			{
				"de_dust2"		""
			}
		}