How to reproduce:
1. client c1 ( clientid1) connects, subscribes to topic A with QoS.EXACTLY_ONCE , unsubscribes topic A and disconnects.
2. client c2 ( clientid2) publishes to topic A with QoS.EXACTLY_ONCE.
3. client c1 ( clientid1) connects back again.
Expectation : client c1 shouldn't receive any messages as it has already unsubscribed
Attached test method to reproduce this issue