diff --git a/core/lib/Drupal/Core/Entity/EntityForm.php b/core/lib/Drupal/Core/Entity/EntityForm.php
index fb015c7..b104c01 100644
--- a/core/lib/Drupal/Core/Entity/EntityForm.php
+++ b/core/lib/Drupal/Core/Entity/EntityForm.php
@@ -409,4 +409,15 @@ public function setEntityManager(EntityManagerInterface $entity_manager) {
     return $this;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function exists($entity_id, array $element, FormStateInterface $form_state) {
+    /** @var \Drupal\Core\Entity\EntityTypeInterface $entity_type */
+    $entity_type = $form_state->getFormObject()->getEntity()->getEntityType();
+    return (bool) \Drupal::entityQuery($entity_type->id())
+      ->condition($entity_type->getKey('id'), $entity_id)
+      ->execute();
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Entity/EntityFormInterface.php b/core/lib/Drupal/Core/Entity/EntityFormInterface.php
index 29b248b..b32877b 100644
--- a/core/lib/Drupal/Core/Entity/EntityFormInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityFormInterface.php
@@ -153,4 +153,19 @@ public function setModuleHandler(ModuleHandlerInterface $module_handler);
    */
   public function setEntityManager(EntityManagerInterface $entity_manager);
 
+  /**
+   * Determines if the entity already exists.
+   *
+   * @param string|int $entity_id
+   *   The entity ID.
+   * @param array $element
+   *   The form element.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return bool
+   *   TRUE if the entity exists, FALSE otherwise.
+   */
+  public static function exists($entity_id, array $element, FormStateInterface $form_state);
+
 }
diff --git a/core/modules/action/src/ActionFormBase.php b/core/modules/action/src/ActionFormBase.php
index 6d4be05..cfbd58d 100644
--- a/core/modules/action/src/ActionFormBase.php
+++ b/core/modules/action/src/ActionFormBase.php
@@ -50,7 +50,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#maxlength' => 64,
       '#description' => $this->t('A unique name for this action. It must only contain lowercase letters, numbers and underscores.'),
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
       ),
     );
     $form['plugin'] = array(
diff --git a/core/modules/block/src/BlockForm.php b/core/modules/block/src/BlockForm.php
index 78acf55..89d9e53 100644
--- a/core/modules/block/src/BlockForm.php
+++ b/core/modules/block/src/BlockForm.php
@@ -130,7 +130,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#description' => $this->t('A unique name for this block instance. Must be alpha-numeric and underscore separated.'),
       '#default_value' => !$entity->isNew() ? $entity->id() : $this->getUniqueMachineName($entity),
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
         'replace_pattern' => '[^a-z0-9_.]+',
         'source' => array('settings', 'label'),
       ),
diff --git a/core/modules/block_content/src/BlockContentTypeForm.php b/core/modules/block_content/src/BlockContentTypeForm.php
index f9a5eb2..e343eaf 100644
--- a/core/modules/block_content/src/BlockContentTypeForm.php
+++ b/core/modules/block_content/src/BlockContentTypeForm.php
@@ -40,7 +40,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#type' => 'machine_name',
       '#default_value' => $block_type->id(),
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
       ),
       '#maxlength' => EntityTypeInterface::BUNDLE_MAX_LENGTH,
       '#disabled' => !$block_type->isNew(),
diff --git a/core/modules/comment/src/CommentTypeForm.php b/core/modules/comment/src/CommentTypeForm.php
index e4f6066..ab642f1 100644
--- a/core/modules/comment/src/CommentTypeForm.php
+++ b/core/modules/comment/src/CommentTypeForm.php
@@ -88,7 +88,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#type' => 'machine_name',
       '#default_value' => $comment_type->id(),
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
       ),
       '#maxlength' => EntityTypeInterface::BUNDLE_MAX_LENGTH,
       '#disabled' => !$comment_type->isNew(),
diff --git a/core/modules/config/tests/config_test/src/ConfigTestForm.php b/core/modules/config/tests/config_test/src/ConfigTestForm.php
index 158e39b..c6723ab 100644
--- a/core/modules/config/tests/config_test/src/ConfigTestForm.php
+++ b/core/modules/config/tests/config_test/src/ConfigTestForm.php
@@ -142,23 +142,4 @@ public function save(array $form, FormStateInterface $form_state) {
     $form_state->setRedirectUrl($this->entity->urlInfo('collection'));
   }
 
-  /**
-   * Determines if the entity already exists.
-   *
-   * @param string|int $entity_id
-   *   The entity ID.
-   * @param array $element
-   *   The form element.
-   * @param \Drupal\Core\Form\FormStateInterface $form_state
-   *   The current state of the form.
-   *
-   * @return bool
-   *   TRUE if the entity exists, FALSE otherwise.
-   */
-  public static function exists($entity_id, array $element, FormStateInterface $form_state) {
-    /** @var \Drupal\Core\Config\Entity\ConfigEntityInterface $entity */
-    $entity = $form_state->getFormObject()->getEntity();
-    return (bool) \Drupal::entityManager()->getStorage($entity->getEntityTypeId())->load($entity_id);
-  }
-
 }
diff --git a/core/modules/contact/src/ContactFormEditForm.php b/core/modules/contact/src/ContactFormEditForm.php
index fa19c93..798b24f 100644
--- a/core/modules/contact/src/ContactFormEditForm.php
+++ b/core/modules/contact/src/ContactFormEditForm.php
@@ -77,7 +77,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#default_value' => $contact_form->id(),
       '#maxlength' => EntityTypeInterface::BUNDLE_MAX_LENGTH,
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
       ),
       '#disabled' => !$contact_form->isNew(),
     );
diff --git a/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php b/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php
index 8596905..4cedb52 100644
--- a/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php
+++ b/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php
@@ -97,26 +97,14 @@ public function form(array $form, FormStateInterface $form_state) {
   }
 
   /**
-   * Determines if the display mode already exists.
-   *
-   * @param string|int $entity_id
-   *   The entity ID.
-   * @param array $element
-   *   The form element.
-   * @param \Drupal\Core\Form\FormStateInterface $form_state
-   *   The current state of the form.
-   *
-   * @return bool
-   *   TRUE if the display mode exists, FALSE otherwise.
+   * {@inheritdoc}
    */
   public static function exists($entity_id, array $element, FormStateInterface $form_state) {
     // Do not allow to add internal 'default' view mode.
     if ($entity_id == 'default') {
       return TRUE;
     }
-    /** @var \Drupal\Core\Config\Entity\ConfigEntityInterface $entity */
-    $entity = $form_state->getFormObject()->getEntity();
-    return (bool) $entity::load($element['#field_prefix'] . $entity_id);
+    return parent::exists($element['#field_prefix'] . $entity_id, $element, $form_state);
   }
 
   /**
diff --git a/core/modules/filter/src/FilterFormatFormBase.php b/core/modules/filter/src/FilterFormatFormBase.php
index 4bc7a9d..b4001a0 100644
--- a/core/modules/filter/src/FilterFormatFormBase.php
+++ b/core/modules/filter/src/FilterFormatFormBase.php
@@ -68,7 +68,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#default_value' => $format->id(),
       '#maxlength' => 255,
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
         'source' => array('name'),
       ),
       '#disabled' => !$format->isNew(),
diff --git a/core/modules/image/src/Form/ImageStyleFormBase.php b/core/modules/image/src/Form/ImageStyleFormBase.php
index 27c98b5..63fdd55 100644
--- a/core/modules/image/src/Form/ImageStyleFormBase.php
+++ b/core/modules/image/src/Form/ImageStyleFormBase.php
@@ -36,7 +36,7 @@ public function form(array $form, FormStateInterface $form_state) {
     $form['name'] = array(
       '#type' => 'machine_name',
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
       ),
       '#default_value' => $this->entity->id(),
       '#required' => TRUE,
diff --git a/core/modules/node/src/NodeTypeForm.php b/core/modules/node/src/NodeTypeForm.php
index a549527..cca2375 100644
--- a/core/modules/node/src/NodeTypeForm.php
+++ b/core/modules/node/src/NodeTypeForm.php
@@ -85,7 +85,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#maxlength' => EntityTypeInterface::BUNDLE_MAX_LENGTH,
       '#disabled' => $type->isLocked(),
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
         'source' => array('name'),
       ),
       '#description' => t('A unique machine-readable name for this content type. It must only contain lowercase letters, numbers, and underscores. This name will be used for constructing the URL of the %node-add page, in which underscores will be converted into hyphens.', array(
diff --git a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
index 9d3e38a..556bf99 100644
--- a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
+++ b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
@@ -77,7 +77,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#type' => 'machine_name',
       '#default_value' => $responsive_image_style->id(),
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
         'source' => array('label'),
       ),
       '#disabled' => (bool) $responsive_image_style->id() && $this->operation != 'duplicate',
diff --git a/core/modules/search/src/Form/SearchPageFormBase.php b/core/modules/search/src/Form/SearchPageFormBase.php
index e0d37a5..4aaa0aa 100644
--- a/core/modules/search/src/Form/SearchPageFormBase.php
+++ b/core/modules/search/src/Form/SearchPageFormBase.php
@@ -103,7 +103,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#disabled' => !$this->entity->isNew(),
       '#maxlength' => 64,
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
       ),
     );
     $form['path'] = array(
diff --git a/core/modules/shortcut/src/ShortcutSetForm.php b/core/modules/shortcut/src/ShortcutSetForm.php
index 9708aee..d053b24 100644
--- a/core/modules/shortcut/src/ShortcutSetForm.php
+++ b/core/modules/shortcut/src/ShortcutSetForm.php
@@ -32,7 +32,7 @@ public function form(array $form, FormStateInterface $form_state) {
     $form['id'] = array(
       '#type' => 'machine_name',
       '#machine_name' => array(
-        'exists' => '\Drupal\shortcut\Entity\ShortcutSet::load',
+        'exists' => [get_class($this), 'exists'],
         'source' => array('label'),
         'replace_pattern' => '[^a-z0-9-]+',
         'replace' => '-',
diff --git a/core/modules/system/src/Form/DateFormatFormBase.php b/core/modules/system/src/Form/DateFormatFormBase.php
index c1ed32c..9976517 100644
--- a/core/modules/system/src/Form/DateFormatFormBase.php
+++ b/core/modules/system/src/Form/DateFormatFormBase.php
@@ -62,22 +62,10 @@ public static function create(ContainerInterface $container) {
   }
 
   /**
-   * Checks for an existing date format.
-   *
-   * @param string|int $entity_id
-   *   The entity ID.
-   * @param array $element
-   *   The form element.
-   * @param \Drupal\Core\Form\FormStateInterface $form_state
-   *   The current state of the form.
-   *
-   * @return bool
-   *   TRUE if this format already exists, FALSE otherwise.
+   * {@inheritdoc}
    */
   public static function exists($entity_id, array $element, FormStateInterface $form_state) {
-    /** @var \Drupal\Core\Config\Entity\ConfigEntityInterface $entity */
-    $entity = $form_state->getFormObject()->getEntity();
-    return (bool) $entity::load($element['#field_prefix'] . $entity_id);
+    return parent::exists($element['#field_prefix'] . $entity_id, $element, $form_state);
   }
 
   /**
diff --git a/core/modules/taxonomy/src/VocabularyForm.php b/core/modules/taxonomy/src/VocabularyForm.php
index c7f48b0..b8cc663 100644
--- a/core/modules/taxonomy/src/VocabularyForm.php
+++ b/core/modules/taxonomy/src/VocabularyForm.php
@@ -42,7 +42,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#default_value' => $vocabulary->id(),
       '#maxlength' => EntityTypeInterface::BUNDLE_MAX_LENGTH,
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
         'source' => array('name'),
       ),
     );
diff --git a/core/modules/user/src/RoleForm.php b/core/modules/user/src/RoleForm.php
index b82b8f6..1a02ef8 100644
--- a/core/modules/user/src/RoleForm.php
+++ b/core/modules/user/src/RoleForm.php
@@ -38,7 +38,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#size' => 30,
       '#maxlength' => 64,
       '#machine_name' => array(
-        'exists' => [$this->entity->getEntityType()->getClass(), 'load'],
+        'exists' => [get_class($this), 'exists'],
       ),
     );
     $form['weight'] = array(