please add :rules about vuetify-mask HOT 1 OPEN

      v-bind:properties="{
        rules: [value => !!value || 'Required.', value => (value && value.length >= 3) || 'Min 3 characters',],
        hideDetails:'auto'
      }"

  <v-text-field-simplemask
    v-bind:properties="prop"
  />


  data: () => ({
    prop:{
        rules: [value => !!value || 'Required.', value => (value && value.length >= 3) || 'Min 3 characters',],
        hideDetails:'auto'
      },
  }),