Issue #1905608 by damiankloip: Fixed EntityReference style plugin has preview method.

core/modules/entity_reference/lib/Drupal/entity_reference/Plugin/views/style/EntityReference.php

@@ -101,17 +101,6 @@ public function render() {
     return $results;
   }
 
-  /**
-   * Overrides \Drupal\views\Plugin\views\display\PathPluginBase::preview().
-   */
-  public function preview() {
-    if (!empty($this->view->live_preview)) {
-      return '<pre>' . check_plain($this->view->render()) . '</pre>';
-    }
-
-    return $this->view->render();
-  }
-
   /**
    * Overrides \Drupal\views\Plugin\views\style\StylePluginBase\StylePluginBase::even_empty().
    */