interdiff impossible; taking evasive action
reverted:
--- b/core/lib/Drupal/Core/Form/FormBuilder.php
+++ a/core/lib/Drupal/Core/Form/FormBuilder.php
@@ -1000,22 +1000,6 @@
       }
       $element['#processed'] = TRUE;
     }
-    $types_to_skip = [
-      'field_ui_table',
-      'table',
-      'tableselect',
-      'hidden',
-      'token',
-      'value',
-      'item',
-      'datelist',
-    ];
-    if (isset($element['#type']) && !in_array($element['#type'], $types_to_skip) && !empty($element['#input']) && empty($element['#attributes']['aria-labelledby'])) {
-      $title_key = in_array($element['#type'], ['button', 'submit']) ? '#value' : '#title';
-      if (!isset($element[$title_key])) {
-        @trigger_error(sprintf('Form elements must have a #title attribute as of Drupal 9.0.0. Form element "%s" of #type "%s" from form "%s" is missing a #title attribute.', implode('][', $element['#array_parents']), $element['#type'], $form_id), E_USER_DEPRECATED);
-      }
-    }
 
     // We start off assuming all form elements are in the correct order.
     $element['#sorted'] = TRUE;
unchanged:
--- a/core/lib/Drupal/Core/Form/FormBuilder.php
+++ b/core/lib/Drupal/Core/Form/FormBuilder.php
@@ -1008,6 +1008,22 @@ public function doBuildForm($form_id, &$element, FormStateInterface &$form_state
       }
       $element['#processed'] = TRUE;
     }
+    $types_to_skip = [
+      'field_ui_table',
+      'table',
+      'tableselect',
+      'hidden',
+      'token',
+      'value',
+      'item',
+      'datelist',
+    ];
+    if (isset($element['#type']) && !in_array($element['#type'], $types_to_skip) && !empty($element['#input']) && empty($element['#attributes']['aria-labelledby'])) {
+      $title_key = in_array($element['#type'], ['button', 'submit']) ? '#value' : '#title';
+      if (!isset($element[$title_key])) {
+        @trigger_error(sprintf('Form elements must have a #title attribute as of Drupal 9.0.0. Form element "%s" of #type "%s" from form "%s" is missing a #title attribute.', implode('][', $element['#array_parents']), $element['#type'], $form_id), E_USER_DEPRECATED);
+      }
+    }
 
     // We start off assuming all form elements are in the correct order.
     $element['#sorted'] = TRUE;
diff -u b/core/modules/book/src/Form/BookAdminEditForm.php b/core/modules/book/src/Form/BookAdminEditForm.php
--- b/core/modules/book/src/Form/BookAdminEditForm.php
+++ b/core/modules/book/src/Form/BookAdminEditForm.php
@@ -223,8 +223,6 @@
 
       $form[$id]['title'] = [
         '#prefix' => !empty($indentation) ? \Drupal::service('renderer')->render($indentation) : '',
-        '#title' => $this->t('Title'),
-        '#title_display' => 'invisible',
         '#type' => 'textfield',
         '#default_value' => $data['link']['title'],
         '#maxlength' => 255,
@@ -242,6 +240,8 @@
 
       $form[$id]['title'] = [
         '#prefix' => !empty($indentation) ? \Drupal::service('renderer')->render($indentation) : '',
+        '#title' => $this->t('Title'),
+        '#title_display' => 'invisible',
         '#type' => 'textfield',
         '#default_value' => $data['link']['title'],
         '#maxlength' => 255,
diff -u b/core/modules/field_ui/src/Form/EntityDisplayFormBase.php b/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
--- b/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
+++ b/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
@@ -448,22 +448,22 @@
         if (!empty($settings_form) || !empty($third_party_settings_form)) {
           $field_row['settings_edit'] = $base_button + [
             '#type' => 'image_button',
+            '#title' => $this->t('Edit'),
             '#name' => $field_name . '_settings_edit',
             '#src' => 'core/misc/icons/787878/cog.svg',
-            '#attributes' => ['class' => ['field-plugin-settings-edit'], 'alt' => $this->t('Edit')],
+            // The title will be copied to the 'alt' tag in
+            // \Drupal\Core\Render\Element\ImageButton::preRenderButton(), so
+            // there's no need to do it here.
+            '#attributes' => ['class' => ['field-plugin-settings-edit']],
             '#op' => 'edit',
             // Do not check errors for the 'Edit' button, but make sure we get
             // the value of the 'plugin type' select.
         if (!empty($settings_form) || !empty($third_party_settings_form)) {
           $field_row['settings_edit'] = $base_button + [
             '#type' => 'image_button',
-            '#title' => $this->t('Edit'),
             '#name' => $field_name . '_settings_edit',
             '#src' => 'core/misc/icons/787878/cog.svg',
-            // The title will be copied to the 'alt' tag in
-            // \Drupal\Core\Render\Element\ImageButton::preRenderButton(), so
-            // there's no need to do it here.
-            '#attributes' => ['class' => ['field-plugin-settings-edit']],
+            '#attributes' => ['class' => ['field-plugin-settings-edit'], 'alt' => $this->t('Edit')],
             '#op' => 'edit',
             // Do not check errors for the 'Edit' button, but make sure we get
             // the value of the 'plugin type' select.
diff -u b/core/modules/language/src/Form/ContentLanguageSettingsForm.php b/core/modules/language/src/Form/ContentLanguageSettingsForm.php
--- b/core/modules/language/src/Form/ContentLanguageSettingsForm.php
+++ b/core/modules/language/src/Form/ContentLanguageSettingsForm.php
@@ -137,7 +137,8 @@
       foreach ($bundles[$entity_type_id] as $bundle => $bundle_info) {
         $form['settings'][$entity_type_id][$bundle]['settings'] = [
           '#type' => 'item',
-          '#label' => $bundle_info['label'],
+          '#title' => $bundle_info['label'],
+          '#title_display' => 'invisible',
           'language' => [
             '#type' => 'language_configuration',
             '#entity_information' => [
@@ -148,8 +149,7 @@
       foreach ($bundles[$entity_type_id] as $bundle => $bundle_info) {
         $form['settings'][$entity_type_id][$bundle]['settings'] = [
           '#type' => 'item',
-          '#title' => $bundle_info['label'],
-          '#title_display' => 'invisible',
+          '#label' => $bundle_info['label'],
           'language' => [
             '#type' => 'language_configuration',
             '#entity_information' => [
diff -u b/core/modules/node/src/Plugin/Search/NodeSearch.php b/core/modules/node/src/Plugin/Search/NodeSearch.php
--- b/core/modules/node/src/Plugin/Search/NodeSearch.php
+++ b/core/modules/node/src/Plugin/Search/NodeSearch.php
@@ -846,7 +846,8 @@
       $form['content_ranking']['rankings'][$var]['value'] = [
         '#type' => 'select',
         '#options' => $options,
-        '#attributes' => ['aria-label' => $this->t("Influence of '@title'", ['@title' => $values['title']])],
+        '#title' => $this->t("Influence of '@title'", ['@title' => $values['title']]),
+        '#title_display' => 'invisible',
         '#default_value' => $this->configuration['rankings'][$var] ?? 0,
       ];
     }
@@ -856,9 +857,8 @@
       ];
       $form['content_ranking']['rankings'][$var]['value'] = [
         '#type' => 'select',
-        '#title' => $this->t("Influence of '@title'", ['@title' => $values['title']]),
-        '#title_display' => 'invisible',
         '#options' => $options,
+        '#attributes' => ['aria-label' => $this->t("Influence of '@title'", ['@title' => $values['title']])],
         '#default_value' => isset($this->configuration['rankings'][$var]) ? $this->configuration['rankings'][$var] : 0,
       ];
     }