Openfire 4.0.0 - Offline Messages: only the first message is delivered to client

Hello everyone.

Until yesterday I used Openfire 3.10.3 with Spark 2.7.4: no problem with offline messages.

This night I have upgraded to new version 4.0.0.

All is OK except the offline messages:

- user A is offline

- user B sent 3 messages to A

- user C sent 2 messages to A

- user D sent 5 messages to A

- when user A connects to Openfire with the Spark client, he only has the first message of user B, the first message of user C and the first message of user D. The other offline messages are lost.

All the 10 messages are present in the Monitoring plugin.

Any idea?

Thank you very much.

Best regards.

Alessandro