Why kafka topics receive messages and streams doesn't?

Question

I've got a complete Confluent Platform on an AKS cluster. I'm trying to send messages inside a ksqldb stream, but the messages arrive only on the topic. This is how I created the stream

"CREATE STREAM PROVA (ID STRING KEY, NUM INTEGER) WITH (KAFKA_TOPIC='topic_prova', KEY_FORMAT='KAFKA', PARTITIONS=1, VALUE_FORMAT='JSON');

and this is the code that sends messages

const KsqldbClient = require("ksqldb-client");
const options = {
    host: "http://ksqldb.ckafka.svc.cluster.local",
    port: 8088,
};
const client = new KsqldbClient(options);

const asyncOperation = async () => {
    await client.connect();
    var i = 0;
    while(i<100){
        const row = {
            id: "value",
            num: 2
        };
        const {data, status, error } = await client.insertInto("PROVA", row);
        console.log(data)
        console.log(status);
        console.log(error)
        i++;
        await new Promise(resolve => setTimeout(resolve, 5000));
    }
    await client.disconnect();
};

asyncOperation();

Here the logs:

{ rows: [ { seq: 0, status: 'ok' } ] }
200
undefined

The topic receives the messages, like shown here.

I don't know how to resolve it, even because i need streams later to aggregate data.