Wrong SHOW PROCEDURE output for SET GLOBAL sysvar1=expr, sysvar2=expr

DELIMITER $$

CREATE OR REPLACE PROCEDURE p1()

BEGIN

  SET GLOBAL max_allowed_packet=16000000, max_error_count=60;

  SELECT @@GLOBAL.max_allowed_packet, @@GLOBAL.max_error_count;

END;

$$

DELIMITER ;

SHOW PROCEDURE CODE p1;

+-----+---------------------------------------------------+

| Pos | Instruction                                       |

+-----+---------------------------------------------------+

|   0 | stmt 31 "SET  GLOBAL max_allowed_packet=16000000" |

|   1 | stmt 31 "SET  max_error_count=60"                 |

|   2 | stmt 0 "SELECT @@GLOBAL.max_allowed_packet, @..." |

+-----+---------------------------------------------------+