reverted:
--- b/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
+++ a/core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php
@@ -264,12 +264,6 @@
         $language = $row->getDestinationProperty($property);
         if (!$entity->hasTranslation($language)) {
           $entity->addTranslation($language);
-          // MigrateUploadTest does an import where it is makes a new revision
-          // when the content type has new_revision as false.
-          // @todo: fix d6/MigrateUploadTest
-          if ($this->storage->getEntityType()->isRevisionable() && $entity->isNewRevision()) {
-            $entity->setNewRevision(TRUE);
-          }
 
           // We're adding a translation, so delete it on rollback.
           $rollback_action = MigrateIdMapInterface::ROLLBACK_DELETE;