diff --git a/core/lib/Drupal/Core/Render/Element/RenderElement.php b/core/lib/Drupal/Core/Render/Element/RenderElement.php
index 35814589b3..0aa67badc5 100644
--- a/core/lib/Drupal/Core/Render/Element/RenderElement.php
+++ b/core/lib/Drupal/Core/Render/Element/RenderElement.php
@@ -264,11 +264,6 @@ public static function preRenderAjaxForm($element) {
       return $element;
     }
 
-    // Add a data attribute to disable automatic refocus after ajax call.
-    if (!empty($element['#ajax']['disable-refocus'])) {
-      $element['#attributes']['data-disable-refocus'] = "true";
-    }
-
     // Add a reasonable default event handler if none was specified.
     if (isset($element['#ajax']) && !isset($element['#ajax']['event'])) {
       switch ($element['#type']) {
@@ -321,6 +316,25 @@ public static function preRenderAjaxForm($element) {
       }
     }
 
+    // Disable automatic refocus after ajax call by adding a data attribute if
+    // the disable-refocus flag has been set.
+    if (isset($element['#ajax']['event'])) {
+      switch ($element['#ajax']['event']) {
+        // Disable automatic refocus for the ajax event 'blur' on default to
+        // avoid an infinite focus loop.
+        case 'blur':
+          if (!isset($element['#ajax']['disable-refocus']) || $element['#ajax']['disable-refocus'] === 'true') {
+            $element['#attributes']['data-disable-refocus'] = "true";
+          }
+          break;
+
+        default:
+          if (isset($element['#ajax']['disable-refocus']) && $element['#ajax']['disable-refocus'] === 'true') {
+            $element['#attributes']['data-disable-refocus'] = "true";
+          }
+      }
+    }
+
     // Attach JavaScript settings to the element.
     if (isset($element['#ajax']['event'])) {
       $element['#attached']['library'][] = 'core/jquery.form';