WP_REST_Blocks_Controller::filter_response_by_context

		$data = parent::filter_response_by_context( $data, $context );

		/*
		 * Remove `title.rendered` and `content.rendered` from the response. It
		 * doesn't make sense for a reusable block to have rendered content on its
		 * own, since rendering a block requires it to be inside a post or a page.
		 */
		unset( $data['title']['rendered'] );
		unset( $data['content']['rendered'] );

		return $data;
	}