diff --git a/core/lib/Drupal/Core/Entity/EntityDefinitionUpdateManager.php b/core/lib/Drupal/Core/Entity/EntityDefinitionUpdateManager.php
index 3ead817..f6d97e1 100644
--- a/core/lib/Drupal/Core/Entity/EntityDefinitionUpdateManager.php
+++ b/core/lib/Drupal/Core/Entity/EntityDefinitionUpdateManager.php
@@ -72,7 +72,7 @@ public function getChangeSummary() {
               break;
 
             case static::DEFINITION_UPDATED:
-              $summary[$entity_type_id][] = $this->t('The %field_name field needs to be updated.', ['%field_name' => $storage_definitions[$field_name]->getLabel()]);
+              $summary[$entity_type_id][] = $this->t('The %field_name (%entity_type) field needs to be updated.', ['%field_name' => $storage_definitions[$field_name]->getLabel(), '%entity_type' => $entity_type_id]);
               break;
 
             case static::DEFINITION_DELETED:
diff --git a/core/modules/aggregator/aggregator.install b/core/modules/aggregator/aggregator.install
index cd7203f..7b00079 100644
--- a/core/modules/aggregator/aggregator.install
+++ b/core/modules/aggregator/aggregator.install
@@ -37,3 +37,24 @@ function aggregator_update_8001() {
 /**
  * @} End of "addtogroup updates-8.0.0-rc".
  */
+
+/**
+ * @addtogroup updates-8.3.x
+ * @{
+ */
+
+
+/**
+ * Update the 'fid' and 'refresh' fields in order to make them required at the
+ * storage level.
+ */
+function aggregator_update_8300() {
+  $manager = \Drupal::entityDefinitionUpdateManager();
+  $manager->updateFieldStorageDefinition($manager->getFieldStorageDefinition('fid', 'aggregator_item'));
+  $manager->updateFieldStorageDefinition($manager->getFieldStorageDefinition('refresh', 'aggregator_feed'));
+}
+
+/**
+ * @} End of "addtogroup updates-8.3.x".
+ */
+
diff --git a/core/modules/aggregator/tests/src/Kernel/Views/AggregatorItemViewsFieldAccessTest.php b/core/modules/aggregator/tests/src/Kernel/Views/AggregatorItemViewsFieldAccessTest.php
index a095d3c..e007d8e 100644
--- a/core/modules/aggregator/tests/src/Kernel/Views/AggregatorItemViewsFieldAccessTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Views/AggregatorItemViewsFieldAccessTest.php
@@ -35,6 +35,7 @@ public function testAggregatorItemFields() {
     $feed = Feed::create([
       'title' => 'Drupal org',
       'url' => 'https://www.drupal.org/rss.xml',
+      'refresh' => 900,
     ]);
     $feed->save();
     $item = Item::create([
diff --git a/core/modules/block_content/block_content.install b/core/modules/block_content/block_content.install
index 4279cde..47c3f52 100644
--- a/core/modules/block_content/block_content.install
+++ b/core/modules/block_content/block_content.install
@@ -61,3 +61,20 @@ function block_content_update_8003() {
   \Drupal::entityDefinitionUpdateManager()
     ->installFieldStorageDefinition('revision_user', 'block_content', 'block_content', $revision_user);
 }
+
+/**
+ * @addtogroup updates-8.3.x
+ * @{
+ */
+
+/**
+ * Update the 'info' field in order to make it required at the storage level.
+ */
+function block_content_update_8300() {
+  $manager = \Drupal::entityDefinitionUpdateManager();
+  $manager->updateFieldStorageDefinition($manager->getFieldStorageDefinition('info', 'block_content'));
+}
+
+/**
+ * @} End of "addtogroup updates-8.3.x".
+ */
diff --git a/core/modules/comment/comment.install b/core/modules/comment/comment.install
index 895c039..c750917 100644
--- a/core/modules/comment/comment.install
+++ b/core/modules/comment/comment.install
@@ -206,5 +206,14 @@ function comment_update_8301() {
 }
 
 /**
+ * Update the 'entity_id' field in order to make it required at the storage
+ * level.
+ */
+function comment_update_8302() {
+  $manager = \Drupal::entityDefinitionUpdateManager();
+  $manager->updateFieldStorageDefinition($manager->getFieldStorageDefinition('entity_id', 'comment'));
+}
+
+/**
  * @} End of "addtogroup updates-8.3.x".
  */
diff --git a/core/modules/menu_link_content/menu_link_content.install b/core/modules/menu_link_content/menu_link_content.install
index 43c75ec..7449685 100644
--- a/core/modules/menu_link_content/menu_link_content.install
+++ b/core/modules/menu_link_content/menu_link_content.install
@@ -16,3 +16,20 @@ function menu_link_content_install() {
   //   https://www.drupal.org/node/1965074
   module_set_weight('menu_link_content', 1);
 }
+
+/**
+ * @addtogroup updates-8.3.x
+ * @{
+ */
+
+/**
+ * Update the 'title' field in order to make it required at the storage level.
+ */
+function menu_link_content_update_8300() {
+  $manager = \Drupal::entityDefinitionUpdateManager();
+  $manager->updateFieldStorageDefinition($manager->getFieldStorageDefinition('title', 'menu_link_content'));
+}
+
+/**
+ * @} End of "addtogroup updates-8.3.x".
+ */
diff --git a/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php b/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
index 9da3de6..350370f 100644
--- a/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
+++ b/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
@@ -213,11 +213,10 @@ protected function processStubRow(Row $row) {
       if ($field_definition->isRequired() && is_null($row->getDestinationProperty($field_name))) {
         // Use the configured default value for this specific field, if any.
         if ($default_value = $field_definition->getDefaultValueLiteral()) {
-          $values[] = $default_value;
+          $values = reset($default_value);
         }
         else {
           // Otherwise, ask the field type to generate a sample value.
-          $field_type = $field_definition->getType();
           /** @var \Drupal\Core\Field\FieldItemInterface $field_type_class */
           $field_type_class = $this->fieldTypeManager
             ->getPluginClass($field_definition->getType());
diff --git a/core/modules/node/node.install b/core/modules/node/node.install
index 2751b2c..489cf69 100644
--- a/core/modules/node/node.install
+++ b/core/modules/node/node.install
@@ -253,5 +253,13 @@ function node_update_8301() {
 }
 
 /**
+ * Update the 'status' field in order to make it required at the storage level.
+ */
+function node_update_8302() {
+  $manager = \Drupal::entityDefinitionUpdateManager();
+  $manager->updateFieldStorageDefinition($manager->getFieldStorageDefinition('status', 'node'));
+}
+
+/**
  * @} End of "addtogroup updates-8.3.x".
  */
diff --git a/core/modules/user/user.install b/core/modules/user/user.install
index a3c2600..3c7a0b7 100644
--- a/core/modules/user/user.install
+++ b/core/modules/user/user.install
@@ -109,7 +109,7 @@ function user_update_8100() {
  */
 
 /**
- * @addtogroup updates-8.3.0-beta
+ * @addtogroup updates-8.3.x
  * @{
  */
 
@@ -122,5 +122,5 @@ function user_update_8300() {
 }
 
 /**
- * @} End of "addtogroup updates-8.3.0-beta".
+ * @} End of "addtogroup updates-8.3.x"
  */