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In Drupal 9 (and a while before), the changed field of the node entity is of type ChangedItem (see BaseFieldDefinition::create('changed') in Node.php).
In Drupal\Core\Field\Plugin\Field\FieldType\ChangedItem, you'll find the following:
public function preSave() {
parent::preSave();
...
if (!$entity->isNew() && $original && $...
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