diff --git a/core/lib/Drupal/Core/Entity/EntityFieldManager.php b/core/lib/Drupal/Core/Entity/EntityFieldManager.php
index 332a709..a0fff7e 100644
--- a/core/lib/Drupal/Core/Entity/EntityFieldManager.php
+++ b/core/lib/Drupal/Core/Entity/EntityFieldManager.php
@@ -223,14 +223,15 @@ protected function buildBaseFieldDefinitions($entity_type_id) {
     // Make sure that revisionable entity types are correctly defined.
     if ($entity_type->isRevisionable() && $entity_type->isTranslatable()) {
       // The 'revision_translation_affected' field should always be defined.
-      if (!isset($base_field_definitions[$keys['revision_translation_affected']])) {
-        $base_field_definitions[$keys['revision_translation_affected']] = BaseFieldDefinition::create('boolean')
-          ->setLabel($this->t('Revision translation affected'))
-          ->setDescription($this->t('Indicates if the last edit of a translation belongs to current revision.'))
-          ->setReadOnly(TRUE)
-          ->setRevisionable(TRUE)
-          ->setTranslatable(TRUE);
-      }
+      // This field has been added unconditionally in Drupal 8.4.0 and it is
+      // overriding any pre-existing definition on purpose so that any
+      // differences are immediately available in the status report.
+      $base_field_definitions[$keys['revision_translation_affected']] = BaseFieldDefinition::create('boolean')
+        ->setLabel($this->t('Revision translation affected'))
+        ->setDescription($this->t('Indicates if the last edit of a translation belongs to current revision.'))
+        ->setReadOnly(TRUE)
+        ->setRevisionable(TRUE)
+        ->setTranslatable(TRUE);
     }
 
     // Assign base field definitions the entity type provider.
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index bf92ce5..2fe2533 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -2014,7 +2014,8 @@ function system_update_8402() {
         ->setDescription(t('Indicates if the last edit of a translation belongs to current revision.'))
         ->setReadOnly(TRUE)
         ->setRevisionable(TRUE)
-        ->setTranslatable(TRUE);
+        ->setTranslatable(TRUE)
+        ->setInitialValue(TRUE);
 
       $definition_update_manager
         ->installFieldStorageDefinition($field_name, $entity_type_id, $entity_type_id, $storage_definition);