sql_mode=ORACLE: Wrong SHOW PROCEDURE output for sysvar:=expr

SET sql_mode=ORACLE;

DELIMITER $$

CREATE OR REPLACE PROCEDURE p1() AS

BEGIN

  max_error_count:=10;

END;

$$

DELIMITER ;

SHOW PROCEDURE CODE p1;

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

| Pos | Instruction      |

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

|   0 | stmt 31 "SET 10" |

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