Using multiple icons does not show up

[changfengoss]

Hi , I have set icons, sets: ['mdi', 'fa] ,default set is mdi . mdi icon is work but the fa icon is not displayed. I want both Mdi and Fa icon to work

vuetify: {
    moduleOptions: {
      /* module specific options */
      importComposables: true
    },
    vuetifyOptions: {
      /* vuetify options */
      icons: {
        defaultSet: 'mdi',
        sets: ['mdi', 'fa']
      }
    }
  },