Inconsistent MariaDB error codes 0, 1045, 2003 when using RESET MASTER and init_connect

# Requires standard m/s setup, use CLI on master to replay the SQL

RESET MASTER;

SET GLOBAL init_connect="foo";

CREATE TABLE t1 (c1 INT, c2 BINARY (25) NOT NULL, c3 SMALLINT(4) NULL, c4 BINARY (15) NOT NULL PRIMARY KEY, c5 SMALLINT NOT NULL UNIQUE KEY,c6 DEC(10,8) NOT NULL DEFAULT 3.141592) ENGINE=MyISAM;

CREATE TABLE t2 (a INT, b SMALLINT NOT NULL, c CHAR(12) NOT NULL, d VARCHAR(64) NOT NULL, e VARCHAR(89), f VARCHAR(5), g LONGBLOB NOT NULL, h BLOB, id BIGINT NOT NULL, KEY(b), KEY(e), PRIMARY KEY(id)) ENGINE=MyISAM;

2024-02-02 11:37:36 5 [ERROR] Slave I/O: error reconnecting to master 'repl_user@127.0.0.1:11699' - retry-time: 60  maximum-retries: 100000  message: , Internal MariaDB error code: 0

2024-02-02 11:37:36 10 [ERROR] Slave I/O: error reconnecting to master 'repl_user@127.0.0.1:10826' - retry-time: 60  maximum-retries: 86400  message: Can't connect to MySQL server on '127.0.0.1' (111 "Connection refused"), Internal MariaDB error code: 2003

2024-02-02 11:36:00 5 [ERROR] Slave I/O: error connecting to master 'repl_user@127.0.0.1:12014' - retry-time: 60  maximum-retries: 100000  message: Access denied for user 'repl_user'@'localhost' (using password: YES), Internal MariaDB error code: 1045