only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Entity/ContentEntityBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
@@ -830,6 +830,7 @@ protected function initializeTranslation($langcode) {
     $translation->translationInitialize = FALSE;
     $translation->typedData = NULL;
     $translation->loadedRevisionId = &$this->loadedRevisionId;
+    $translation->isDefaultRevision = &$this->isDefaultRevision;
 
     return $translation;
   }
@@ -1117,6 +1118,9 @@ public function __clone() {
     $values = $this->values;
     $this->values = &$values;
 
+    $default_revision = $this->isDefaultRevision;
+    $this->isDefaultRevision = &$default_revision;
+
     foreach ($this->fields as $name => $fields_by_langcode) {
       $this->fields[$name] = [];
       // Untranslatable fields may have multiple references for the same field