diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
index 946645d..1cd854f 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
@@ -191,6 +191,9 @@ public function getValue() {
     if ($this->hasNewEntity()) {
       $values['entity'] = $this->entity;
     }
+    if ($this->target_id === static::$NEW_ENTITY_MARKER && $this->entity && !$this->entity->isNew()) {
+      $values['target_id'] = $this->entity->id();
+    }
     return $values;
   }
 
diff --git a/core/modules/entity_reference/src/Tests/EntityReferenceItemTest.php b/core/modules/entity_reference/src/Tests/EntityReferenceItemTest.php
index 0898f48..f7150d3 100644
--- a/core/modules/entity_reference/src/Tests/EntityReferenceItemTest.php
+++ b/core/modules/entity_reference/src/Tests/EntityReferenceItemTest.php
@@ -208,6 +208,12 @@ public function testEntitySaveOrder() {
     $entity->name->value = $this->randomMachineName();
     // Now save the term.
     $term->save();
+    // Now serialize it.
+    $entity = serialize($entity);
+    // And unserialize it.
+    $entity = unserialize($entity);
+    // Now attempt to get the entity value.
+    $entity->get('field_test_taxonomy_term')->entity;
     // And then the entity.
     $entity->save();
     $this->assertEqual($entity->field_test_taxonomy_term->entity->id(), $term->id());