diff -u b/core/misc/ajax.es6.js b/core/misc/ajax.es6.js
--- b/core/misc/ajax.es6.js
+++ b/core/misc/ajax.es6.js
@@ -706,7 +706,7 @@
     // when there is a form such that this.$form.ajaxSubmit() is used instead of
     // $.ajax(). When there is no form and $.ajax() is used, beforeSerialize()
     // isn't called, but don't rely on that: explicitly check this.$form.
-    if (this.$form && $.contains(document, this.$form.get(0))) {
+    if (this.$form) {
       const settings = this.settings || drupalSettings;
       Drupal.detachBehaviors(this.$form.get(0), settings, 'serialize');
     }
@@ -774,7 +774,7 @@
     // when there is a form such that this.$form.ajaxSubmit() is used instead of
     // $.ajax(). When there is no form and $.ajax() is used, beforeSerialize()
     // isn't called, but don't rely on that: explicitly check this.$form.
-    if (this.$form) {
+    if (this.$form && $.contains(document, this.$form.get(0))) {
       const settings = this.settings || drupalSettings;
       Drupal.detachBehaviors(this.$form.get(0), settings, 'serialize');
     }
@@ -885,7 +885,7 @@
     // attachBehaviors() called on the new content from processing the response
     // commands is not sufficient, because behaviors from the entire form need
     // to be reattached.
-    if (this.$form && $.contains(document, this.$form.get(0))) {
+    if (this.$form) {
       const settings = this.settings || drupalSettings;
       Drupal.attachBehaviors(this.$form.get(0), settings);
     }
@@ -955,9 +955,8 @@
     $(this.wrapper).show();
     // Re-enable the element.
     $(this.element).prop('disabled', false);
-    // Reattach behaviors, if they were detached in beforeSerialize(), and the
-    // form is still part of the document.
-    if (this.$form && $.contains(document, this.$form.get(0))) {
+    // Reattach behaviors, if they were detached in beforeSerialize().
+    if (this.$form) {
       const settings = this.settings || drupalSettings;
       Drupal.attachBehaviors(this.$form.get(0), settings);
     }
@@ -1021,7 +1020,7 @@
     // attachBehaviors() called on the new content from processing the response
     // commands is not sufficient, because behaviors from the entire form need
     // to be reattached.
-    if (this.$form) {
+    if (this.$form && $.contains(document, this.$form.get(0))) {
       const settings = this.settings || drupalSettings;
       Drupal.attachBehaviors(this.$form.get(0), settings);
     }
@@ -1089,8 +1088,9 @@
     $(this.wrapper).show();
     // Re-enable the element.
     $(this.element).prop('disabled', false);
-    // Reattach behaviors, if they were detached in beforeSerialize().
-    if (this.$form) {
+    // Reattach behaviors, if they were detached in beforeSerialize(), and the
+    // form is still part of the document.
+    if (this.$form && $.contains(document, this.$form.get(0))) {
       const settings = this.settings || drupalSettings;
       Drupal.attachBehaviors(this.$form.get(0), settings);
     }
diff -u b/core/misc/ajax.js b/core/misc/ajax.js
--- b/core/misc/ajax.js
+++ b/core/misc/ajax.js
@@ -325,7 +325,7 @@
   };
 
   Drupal.Ajax.prototype.beforeSerialize = function (element, options) {
-    if (this.$form && $.contains(document, this.$form.get(0))) {
+    if (this.$form) {
       var settings = this.settings || drupalSettings;
       Drupal.detachBehaviors(this.$form.get(0), settings, 'serialize');
     }
@@ -339,7 +339,7 @@
   };
 
   Drupal.Ajax.prototype.beforeSerialize = function (element, options) {
-    if (this.$form) {
+    if (this.$form && $.contains(document, this.$form.get(0))) {
       var settings = this.settings || drupalSettings;
       Drupal.detachBehaviors(this.$form.get(0), settings, 'serialize');
     }
@@ -423,7 +423,7 @@
       }
     }
 
-    if (this.$form && $.contains(document, this.$form.get(0))) {
+    if (this.$form) {
       var settings = this.settings || drupalSettings;
       Drupal.attachBehaviors(this.$form.get(0), settings);
     }
@@ -451,7 +451,7 @@
       }
     }
 
-    if (this.$form) {
+    if (this.$form && $.contains(document, this.$form.get(0))) {
       var settings = this.settings || drupalSettings;
       Drupal.attachBehaviors(this.$form.get(0), settings);
     }
@@ -465,7 +465,7 @@
 
     $(this.element).prop('disabled', false);
 
-    if (this.$form && $.contains(document, this.$form.get(0))) {
+    if (this.$form) {
       var settings = this.settings || drupalSettings;
       Drupal.attachBehaviors(this.$form.get(0), settings);
     }
@@ -493,7 +493,7 @@
 
     $(this.element).prop('disabled', false);
 
-    if (this.$form) {
+    if (this.$form && $.contains(document, this.$form.get(0))) {
       var settings = this.settings || drupalSettings;
       Drupal.attachBehaviors(this.$form.get(0), settings);
     }
diff -u b/core/modules/views_ui/tests/src/FunctionalJavascript/FilterCriteriaTest.php b/core/modules/views_ui/tests/src/FunctionalJavascript/FilterCriteriaTest.php
--- b/core/modules/views_ui/tests/src/FunctionalJavascript/FilterCriteriaTest.php
+++ b/core/modules/views_ui/tests/src/FunctionalJavascript/FilterCriteriaTest.php
@@ -42,13 +42,7 @@
     $assert_session = $this->assertSession();
     $page = $this->getSession()->getPage();
 
-    // Use the 'And/Or Rearrange' link for fields to open a dialog.
-    $dropbutton = $page->find('css', '.views-ui-display-tab-bucket.filter .dropbutton-toggle button');
-    $dropbutton->click();
-    $add_link = $page->findById('views-rearrange-filter');
-    $this->assertTrue($add_link->isVisible(), 'And/Or Rearrange button found.');
-    $add_link->click();
-    $assert_session->assertWaitOnAjaxRequest();
+    $this->openFilterDialog();
 
     // Add a new filter group.
     $create_new_filter_group = $page->findById('views-add-group-link');
@@ -73,7 +67,10 @@
     $this->assertNotNull($page->findLink('User: Last access (>= -15 minutes)'));
 
     // Add group again to test drag-n-drop.
-    $create_new_filter_group = $page->findById('views-add-group-link');
+    $this->openFilterDialog();
+
+    $this->assertSession()->waitForLink('Create new filter group', 20000);
+    $create_new_filter_group = $page->findLink('Create new filter group');
     $this->assertTrue($create_new_filter_group->isVisible(), 'Add group link found.');
     $create_new_filter_group->click();
     $assert_session->assertWaitOnAjaxRequest();
@@ -90,2 +87,16 @@
 
+  /**
+   *  Use the 'And/Or Rearrange' link for fields to open a dialog.
+   */
+  protected function openFilterDialog() {
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
+    $dropbutton = $page->find('css', '.views-ui-display-tab-bucket.filter .dropbutton-toggle button');
+    $dropbutton->click();
+    $add_link = $page->findById('views-rearrange-filter');
+    $this->assertTrue($add_link->isVisible(), 'And/Or Rearrange button found.');
+    $add_link->click();
+    $assert_session->assertWaitOnAjaxRequest();
+  }
+
 }