Error expected when STARTUP with BEFORE, SHUTDOWN with AFTER in system triggers

CREATE TABLE t (a int);

CREATE TRIGGER k1 AFTER STARTUP INSERT INTO test.t VALUES (1);

CREATE TRIGGER k2 BEFORE SHUTDOWN INSERT INTO test.t VALUES (2);

UPDATE mysql.event SET `when`='BEFORE' WHERE name='k1';

UPDATE mysql.event SET `when`='AFTER' WHERE name='k2';

SHOW CREATE TRIGGER k1;

SHOW CREATE TRIGGER k2;

DROP TRIGGER k1,k2;

DROP TABLE t;

Server version: 13.2.0-MariaDB-asan-debug-log source revision: d0127c512ccf492c4f25176

SHOW CREATE TRIGGER k1;

Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created

k1	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` TRIGGER `k1` BEFORE STARTUP INSERT INTO test.t VALUES (1)	latin1	latin1_swedish_ci	utf8mb4_uca1400_ai_ci	2026-10-27 18:15:51.00

SHOW CREATE TRIGGER k2;

Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created

k2	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` TRIGGER `k2` AFTER SHUTDOWN INSERT INTO test.t VALUES (2)	latin1	latin1_swedish_ci	utf8mb4_uca1400_ai_ci	2026-10-27 18:15:51.00

CREATE TRIGGER d1 AFTER STARTUP SET @x=1;

UPDATE mysql.event SET kind='DDL' WHERE name='d1';

SHOW CREATE TRIGGER d1;

DROP TRIGGER d1;

Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created

d1	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` TRIGGER `d1` AFTER DDL SET @x=1	latin1	latin1_swedish_ci	utf8mb4_uca1400_ai_ci	2026-10-27 18:29:49.00