Directory entry is not formatted after adding to a data table

  <xs:element name="edition" type="nxs:book_editionListType"/>
  <xs:complexType name="book_editionListType">
    <xs:sequence>
      <xs:element name="item" type="nxs:book_editionType" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name="book_editionType">
    <xs:sequence>
      <xs:element name="year" type="xs:string"/>
      <xs:element name="editor">
        <xs:simpleType>
          <xs:restriction base="xs:string" ref:resolver="directoryResolver" ref:directory="editors"/>
        </xs:simpleType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

    <nuxeo-data-table items="{{document.properties.book:edition}}" page-size="40" editable="" empty-label="noResults">
      <nuxeo-data-table-column name="[[i18n('editions')]]" flex="150">
        <template>[[formatDirectory(item.editor)]]</template>
      </nuxeo-data-table-column>
      <nuxeo-data-table-column name="[[i18n('name')]]" flex="150">
        <template>[[item.year]]</template>
      </nuxeo-data-table-column>
      <nuxeo-data-table-form>
        <template>
          <nuxeo-directory-suggestion dbl10n="" required="" class="col-12" min-chars="0" directory-name="editors" value="{{item.editor}}">
          </nuxeo-directory-suggestion>
          <nuxeo-input value="{{item.year}}">
          </nuxeo-input>
        </template>
      </nuxeo-data-table-form>
    </nuxeo-data-table>