diff -u b/core/lib/Drupal/Core/Entity/EntityChangedInterface.php b/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
--- b/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
@@ -22,7 +22,7 @@
 interface EntityChangedInterface {
 
   /**
-   * Gets the timestamp of the last entity change for current translation.
+   * Gets the timestamp of the last entity change for the current translation.
    *
    * @return int
    *   The timestamp of the last entity save operation.
diff -u b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/ChangedItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/ChangedItem.php
--- b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/ChangedItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/ChangedItem.php
@@ -31,42 +31,36 @@
   public function preSave() {
     parent::preSave();
 
-    // @todo Knowing if the current translation was modified or not is generally
-    //   useful. There's a follow-up issue to reduce the nesting here and to
-    //   offer an accessor for this information. See
-    //   https://www.drupal.org/node/2453153
-    $entity = $this->getEntity();
-    if ($entity->isNew()){
-      // Allow the changed timestamp to be set manually on entity creation,
-      // for example when migration is running.
-      if (!$this->value) {
-        $this->value = REQUEST_TIME;
-      }
+    // Set the timestamp to request time if it is not set.
+    if (!$this->value) {
+      $this->value = REQUEST_TIME;
     }
     else {
-      // Don't allow an illegal value.
-      if (!$this->value) {
-        $this->value = REQUEST_TIME;
-      }
-      else {
+      // On an existing entity the changed timestamp will only be set to request
+      // time automatically if at least one other field value of the entity has
+      // changed. This detection doesn't run on new entities and will be turned
+      // off if the changed timestamp is set manually before save, for example
+      // during migrations or using
+      // \Drupal\content_translation\ContentTranslationMetadataWrapperInterface::setChangedTime().
+      // @todo Knowing if the current translation was modified or not is
+      //   generally useful. There's a follow-up issue to reduce the nesting
+      //   here and to offer an accessor for this information. See
+      //   https://www.drupal.org/node/2453153
+      $entity = $this->getEntity();
+      if (!$entity->isNew()) {
         $field_name = $this->getFieldDefinition()->getName();
-        // We have to clone the original because getTranslation() will modify
-        // the state of original.
+        // Clone $entity->original to avoid modifying it when calling
+        // getTranslation().
         $original = clone $entity->original;
-        if ($this->getFieldDefinition()->isTranslatable()) {
+        $translatable = $this->getFieldDefinition()->isTranslatable();
+        if ($translatable) {
           $original = $original->getTranslation($entity->language()->getId());
         }
-        // If the timestamp has not been set explicitly auto detect a
-        // modification of the current translation and set the timestamp if
-        // needed. An example of setting the timestamp explicitly is
-        // \Drupal\content_translation\ContentTranslationMetadataWrapperInterface::setChangedTime().
-        if ($this->value == $original->{$field_name}->value) {
-          foreach ($entity->getFieldDefinitions() as $other_field_definition) {
-            $other_field_name = $other_field_definition->getName();
-            if ($other_field_name != $field_name && $other_field_definition->isTranslatable()) {
+        if ($this->value == $original->get($field_name)->value) {
+          foreach ($entity->getFieldDefinitions() as $other_field_name => $other_field_definition) {
+            if ($other_field_name != $field_name && !$other_field_definition->isComputed() && (!$translatable || $other_field_definition->isTranslatable())) {
               $items = $entity->get($other_field_name)->filterEmptyItems();
-              $original_items = $original->get($other_field_name)
-                ->filterEmptyItems();
+              $original_items = $original->get($other_field_name)->filterEmptyItems();
               if (!$items->equals($original_items)) {
                 $this->value = REQUEST_TIME;
                 break;
diff -u b/core/modules/node/node.module b/core/modules/node/node.module
--- b/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -743,7 +743,7 @@
  * @param $nid
  *   The ID of a node.
  * @param string $langcode
- *   (optional) The language to get the last changed time for. If omitted the
+ *   (optional) The language to get the last changed time for. If omitted, the
  *   last changed time across all translations will be returned.
  *
  * @return string
diff -u b/core/modules/system/src/Tests/Entity/ContentEntityChangedTest.php b/core/modules/system/src/Tests/Entity/ContentEntityChangedTest.php
--- b/core/modules/system/src/Tests/Entity/ContentEntityChangedTest.php
+++ b/core/modules/system/src/Tests/Entity/ContentEntityChangedTest.php
@@ -58,7 +58,8 @@
 
     // We can't assert equality here because the created time is set to the
     // request time, while instances of ChangedTestItem use the current
-    // timestamp every time.
+    // timestamp every time. Therefor we check if the changed timestamp is
+    // between the created time and now.
     $this->assertTrue(
       ($entity->getChangedTime() >= $entity->get('created')->value) &&
       (($entity->getChangedTime() - $entity->get('created')->value) <= time() - REQUEST_TIME),
@@ -83,7 +84,7 @@
 
     $this->assertTrue(
       $german->getChangedTime() > $entity->getChangedTime(),
-      'Changed time of German translation is newer then the original language.'
+      'Changed time of the German translation is newer then the original language.'
     );
 
     $this->assertEqual(
@@ -144,9 +145,9 @@
       'Changed time of the German translation did not change.'
     );
 
-    // Current state: changed time of original language (en) is newer than the
-    // changed time of the German translation. Now test that entity queries work
-    // as expected.
+    // At this point the changed time of the original language (en) is newer
+    // than the changed time of the German translation. Now test that entity
+    // queries work as expected.
     $storage = $this->entityManager->getStorage('entity_test_mul_changed');
 
     $query = $storage->getQuery();
@@ -162,7 +163,7 @@
 
     $this->assertEqual(
       reset($ids), $entity->id(),
-      'Entity query can access changed time of original language.'
+      'Entity query can access changed time of original language by setting the original language as condition.'
     );
 
     $query = $storage->getQuery();
@@ -194,7 +195,7 @@
 
     $this->assertEqual(
       reset($ids), $entity->id(),
-      'Entity query can access changed time of German translation.'
+      'Entity query can access changed time of the German translation.'
     );
 
     $query = $storage->getQuery();
@@ -202,7 +203,7 @@
 
     $this->assertEqual(
       reset($ids), $entity->id(),
-      'Entity query can access changed time of German translation.'
+      'Entity query can access changed time of the German translation.'
     );
 
     $query = $storage->getQuery();
@@ -315,7 +316,7 @@
 
     $this->assertTrue(
       $german->getChangedTime() > $entity->getChangedTime(),
-      'Changed time of German translation is newer then the original language.'
+      'Changed time of the German translation is newer then the original language.'
     );
 
     $this->assertEqual(
@@ -350,7 +351,7 @@
 
     $this->assertTrue(
       $german->getChangedTime() > $changed_de,
-      'Changed time of German translation did change.'
+      'Changed time of the German translation did change.'
     );
 
     $this->assertEqual(