Cannot rename root at the top level folder

The test old_functional/test_local_move_and_rename.py::TestLocalMoveAndRename::test_local_rename_sync_root_folder passes but we always get this error:

HTTPError(404), error: Failed to invoke operation: Document.Move, Failed to invoke operation Document.Move, , server trace: None

In fact, the parent_ref in Remote.move2() equals org.nuxeo.drive.service.impl.DefaultTopLevelFolderItemFactory# and the final value passed to the Document.Move() operation is empty.