dao-jun commented on issue #20099:
URL: https://github.com/apache/pulsar/issues/20099#issuecomment-2123050102
I maybe understand what caused the issue, try set
`isAckReceiptEnabled(true)` to true when create consumer.
```java
Consumer consumer = client.newConsumer(Schema.STRING)
.topic(t)
.subscriptionName("frozen")
// enable ack receipt
.isAckReceiptEnabled(true)
.subscriptionType(SubscriptionType.Shared)
.subscribe();
```
Then, try you test again.
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