diff --git a/core/lib/Drupal/Core/Entity/ContentEntityBase.php b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
index aff5209..071f584 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
@@ -385,9 +385,10 @@ protected function getTranslatedField($name, $langcode) {
    * {@inheritdoc}
    */
   public function set($name, $value, $notify = TRUE) {
-    $this->get($name)->setValue($value, FALSE);
-    // Directly notify ourselves, so we can take changes into account.
-    $this->onChange($name);
+    // Assign the value on the child and overrule notify such that we get
+    // notified to handle changes afterwards. We can ignore notify as there is
+    // no parent to notify anyway.
+    $this->get($name)->setValue($value, TRUE);
   }
 
   /**
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 b7fa954..44063ad 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
@@ -140,9 +140,9 @@ public static function schema(FieldStorageDefinitionInterface $field_definition)
    * {@inheritdoc}
    */
   public function setValue($values, $notify = TRUE) {
-    // Treat the values as property value of the entity property, if no array
-    // is given as this handles entity ids and objects.
     if (isset($values) && !is_array($values)) {
+      // If either a scalar or an object was passed as the value for the item,
+      // assign it to the 'entity' property since that works for both cases.
       $this->set('entity', $values, $notify);
     }
     else {
diff --git a/core/modules/text/src/Plugin/Field/FieldType/TextItemBase.php b/core/modules/text/src/Plugin/Field/FieldType/TextItemBase.php
index 17b7ef0..972b6e2 100644
--- a/core/modules/text/src/Plugin/Field/FieldType/TextItemBase.php
+++ b/core/modules/text/src/Plugin/Field/FieldType/TextItemBase.php
@@ -64,7 +64,7 @@ public function onChange($property_name, $notify = TRUE) {
     foreach ($this->definition->getPropertyDefinitions() as $property => $definition) {
       if ($definition->getClass() == '\Drupal\text\TextProcessed') {
         if ($property_name == 'format' || ($definition->getSetting('text source') == $property_name)) {
-          $this->set($property, NULL, FALSE);
+          $this->writePropertyValue($property, NULL);
         }
       }
     }