Affects Version/s: 5.5.1, 5.6.0
Fix Version/s: 5.7.0
This is what it seems to take to reproduce this:
• The durable subscriber is connected to the message broker, using the failover protocol
• The message broker is then restarted (with the client running)
• The client application is then restarted
o The client now receives two copies of every message!
• Try restarting the client again
o The client now receives three copies of every message!
• And so on...