Persistent sessions not working with V5 protocol

[TorakikiITA]

Hello,
talking about the "simple" client, not the managed one, it does seem that the persistent session is not working with V5 protocol.
Here's the behavior (tested with multiple brokers to make sure it wasn't a broker issue):

1. connect with V5 protocol, clean session set to false, clientId "my-persistent-clientid".
2. subscribe a topic "topicTest/01", with qos 1 or 2.
3. disconnect
4. with another clientid, publish something on "topicTest/01" with qos 1 or 2.
5. reconnect with the same settings of point 1: V5 protocol, clean session set to false, clientId "my-persistent-clientid"
6. nothing is received

If I'm doing the same with V311 protocol, everything is working fine.

Here's the code for the subscriber:
`

var options = new MqttClientOptionsBuilder()
    .WithProtocolVersion(MqttProtocolVersion.V500)
    .WithClientId("my-persistent-clientid")
    .WithTcpServer("myhost", 8883) // Adjust broker host
    .WithCredentials("myusername", "mypwd") // Adjust username and password
    .WithCleanSession(false)
    .WithTlsOptions(
        new MqttClientTlsOptions
        {
            UseTls = clientSettings.UseTls,
            IgnoreCertificateChainErrors = true,
            IgnoreCertificateRevocationErrors = true,
            AllowUntrustedCertificates = true,
            CertificateValidationHandler = delegate { return true; }
        }
    )
    .Build();

var mqttFactory = new MqttFactory();
using var mqttClient = mqttFactory.CreateMqttClient();

Task local_ApplicationMessageReceivedAsync(MqttApplicationMessageReceivedEventArgs arg)
{
    Console.WriteLine($"Client id {arg.ClientId}, topic {arg.ApplicationMessage.Topic}, message received {arg.ApplicationMessage.ConvertPayloadToString()}");
    return Task.CompletedTask;
}

mqttClient.ApplicationMessageReceivedAsync += local_ApplicationMessageReceivedAsync;
mqttClient.ConnectAsync(options).Wait();
mqttClient.SubscribeAsync(topic: "topicTest/01", qualityOfServiceLevel: MqttQualityOfServiceLevel.ExactlyOnce).Wait();
Console.WriteLine("Press any key to exit.");
Console.ReadLine();
mqttClient.DisconnectAsync().Wait();

`