To Reproduce

1. Consumer config: SubscriptionMode=Shared, SubscriptionName=Test1, ack Timeout=10000ms, enable Dead Letter Policy and setMaxRedeliveryCount=3
2. Run 3 Consumers with the above config in 3 parallel threads. The consumers will not send the ACK
3. Send a message to the topic which the consumers are listening to
4. Because the ACK will not be sent, the message will be sent to the dead letter topic after the redelivery count is exceeded.

Expected behavior
Only one message is sent to dead-letters topic

Actual behavior
The message is sent to the dead-letters topic twice