Schema properties not displayed in the catalogue for custom elements

When I play with the schema, it does not appear anything on the right panel

//You can use either @schema or @doctype annotation in your model
/**

• @schema validation
  */
  document: { type: Object }

The error can be seen on https://connect.nuxeo.com/nuxeo/designer/?project=gcarlin-SANDBOX, in the my-validation-element.html element