event->msg_id always 0 in MQTT_EVENT_DATA

[lukunnr]

I hava subscribe a topic use esp_mqtt_client_subscribe and return msg_id is 30233 , but when i usr other mqtt client send msg to dut , dut recv data is OK from MQTT_EVENT_DATA , but print event->msg_id always 0;
case MQTT_EVENT_DATA:
ESP_LOGI(TAG, "MQTT_EVENT_DATA");
printf("TOPIC=%.*s\r\n", event->topic_len, event->topic);
printf("DATA=%.*s\r\n", event->data_len, event->data);
printf("msgid=%d\n",event->msg_id); // <<<<<< here