subscribing qos is 0, but receive retained msg qos is 2

[airfo11]

Describe the bug

My mqtt Server has some reatined message with qos 2.
The server return retained message with qos 2 after client subscribe with qos 0.

Which component is your bug related to?

• Server (MQTTnet 4.1.2.350)

To Reproduce

1. Publish some msg with qos is 2 and retained.
2. Subscribe with qos is 0

Expected behavior

Receive retained msg with the qos as the same with subscription.

Code example

I use 3.1.2 is fine, but it get fault when i upgrade to 4.x.

I found 3.1.2 code bellow, it will overwrite before publishing retained msg.

//MQTTnet 3.1.2
async Task<MqttPublishPacket> CreatePublishPacket(MqttQueuedApplicationMessage queuedApplicationMessage)
{
    var publishPacket = _channelAdapter.PacketFormatterAdapter.DataConverter.CreatePublishPacket(queuedApplicationMessage.ApplicationMessage);
    //Use the qos of subscription
    publishPacket.QualityOfServiceLevel = queuedApplicationMessage.SubscriptionQualityOfServiceLevel;

    //...(ignored)

    return publishPacket;

Thank you.

[chkr1011]

This will be released in version 4.1.3.x.