Unknown command errors when semi-sync replication runs through MaxScale

server4  | 2023-10-05  8:42:04 49 [ERROR] Error reading packet from server: Unknown command (server_errno=1047)

server4  | 2023-10-05  8:42:04 49 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'binlog.000002' at position 3948; GTID position '0-3000-27'

server1  | 2023-10-05  8:42:04 13 [ERROR] Read semi-sync reply magic number error

server1  | 2023-10-05  8:42:04 73 [Note] Start binlog_dump to slave_server(3003), pos(binlog.000002, 3948), using_gtid(1), gtid('0-3000-27')

server1  | 2023-10-05  8:42:04 72 [Note] Stop semi-sync binlog_dump to slave (server_id: 3003)