Update scheduler.module.

The constraints were not executing in a particular scenario.

Closes #3500296

scheduler.module

@@ -805,6 +805,28 @@ function scheduler_entity_base_field_info(EntityTypeInterface $entity_type) {
   return $fields;
 }
 
+/**
+ * Implements hook_entity_bundle_field_info_alter().
+ */
+function scheduler_entity_bundle_field_info_alter(&$fields, EntityTypeInterface $entity_type, $bundle) {
+  // This is necessary for content types where the title label is changed from
+  // the default "Title" to something else. In this case, the field are
+  // considered a bundle field and the constraint must be added here. This is
+  // expected (not a Drupal bug).
+  // Additional info: https://www.drupal.org/project/drupal/issues/3193351.
+  $entity_types = \Drupal::service('scheduler.manager')->getPluginEntityTypes();
+
+  if (in_array($entity_type->id(), $entity_types)) {
+    if (!empty($fields['publish_on'])) {
+      $fields['publish_on']->addConstraint('SchedulerPublishOn', []);
+    }
+
+    if (!empty($fields['unpublish_on'])) {
+      $fields['unpublish_on']->addConstraint('SchedulerUnpublishOn', []);
+    }
+  }
+}
+
 /**
  * Implements hook_action_info_alter().
  */