Unexpected ER_DUP_KEY after OPTIMIZE on MyISAM table with vector key

CREATE TABLE t (v VECTOR(1) NOT NULL DEFAULT 0x30303030, VECTOR(v)) ENGINE=MyISAM;

INSERT INTO t () VALUES (),(),(),();

DELETE FROM t LIMIT 1;

OPTIMIZE TABLE t;

INSERT INTO t SELECT * FROM t;

# Cleanup

DROP TABLE t;

mysqltest: At line 5: query 'INSERT INTO t SELECT * FROM t' failed: ER_DUP_KEY (1022): Can't write; duplicate key in table 't'

--source include/have_binlog_format_row.inc

--source include/master-slave.inc

CREATE TABLE t (v VECTOR(1) NOT NULL DEFAULT 0x30303030, VECTOR(v)) ENGINE=MyISAM;

INSERT INTO t () VALUES (),(),(),();

DELETE FROM t LIMIT 1;

OPTIMIZE TABLE t;

--error ER_DUP_KEY

INSERT INTO t SELECT * FROM t;

INSERT INTO t SELECT * FROM t;

--sync_slave_with_master

# Cleanup

--connection master

DROP TABLE t;

--source include/rpl_end.inc

2024-10-21 14:00:23 7 [ERROR] Slave SQL: Could not execute Write_rows_v1 event on table test.t; Can't write; duplicate key in table 't', Error_code: 1022; handler error HA_ERR_FOUND_DUPP_KEY; the event's master log master-bin.000001, end_log_pos 0, Gtid 0-1-5, Internal MariaDB error code: 1022

2024-10-21 14:00:23 7 [Warning] Slave: Can't write; duplicate key in table 't' Error_code: 1022