Package type is wrongly DENIED when called by a low privilege invoker

SET sql_mode=ORACLE;

CREATE DATABASE secdb;

CREATE DATABASE appdb;

DELIMITER $$;

CREATE PACKAGE secdb.vault AS

  TYPE creds IS RECORD(username VARCHAR(64), pw VARCHAR(128));

  FUNCTION f RETURN INT;

END;

$$

CREATE PACKAGE BODY secdb.vault AS FUNCTION f RETURN INT AS BEGIN RETURN 42; END; END;

$$

CREATE DEFINER=root@localhost PROCEDURE appdb.pJ AS r secdb.vault.creds;

BEGIN r.username:='admin'; SELECT r.username; END;

$$

CREATE DEFINER=root@localhost PROCEDURE appdb.pR AS x INT;

BEGIN x:=secdb.vault.f(); SELECT x; END;

$$

DELIMITER ;$$

CREATE USER low@localhost;

GRANT ALL ON appdb.* TO low@localhost;   # NO privilege on secdb

connect(lowconn, localhost, low,,appdb);

SET sql_mode=ORACLE;

CALL appdb.pR();          # Works fine -> 42 (definer's rights honored for package ROUTINE)

CALL appdb.pJ();          # Shows denied error even with definer's rights : ERROR 1457 (HY000): Failed to load routine appdb.pJ (internal code -6). For more details, run SHOW WARNINGS