WebSocket close connection issue

[Dumra]

Hey, guys. Thanks for the great async web socket package.
I have only one issue with that.

After closing the connection to the socket in the k6 test with
ws.close()
or interrupting the k6 test (after establishing a connection and sending a few messages), the server I'm testing receives all the messages sent during that connection again.

import {WebSocket} from 'k6/experimental/websockets';


const ws = new WebSocket(url);
ws.onopen = () => {
    ws.send(JSON.stringify({ msg: 'message 1' })); // Server receives message 1
    sleep(1);
    ws.send(JSON.stringify({ msg: 'message 2' })); // Server receives message 2
    sleep(1);
    ws.close();   // Server receives message 1 and message 2 again: 4 in total (only 2 messages showed in k6 output test metrics)
};

Will be grateful for any help, thanks.