UndeliverableException on java.io.IOException: Connection closed

[JPF1964]

After we updated opendj 4.8.2 to 4.9.0 we have these errors in the errors log:
msg=GRIZZLY0011: Uncaught exception on thread Thread[#114,OpenDJ LDAP SDK Grizzly selector thread(4) SelectorRunner,5,Directory Server Thread Group] exception=UndeliverableException: The exception could not be delivered to the consumer because it has already canceled/disposed the flow or the exception has nowhere to go to begin with. Further reading: https://github.com/ReactiveX/RxJava/wiki/What's-different-in-2.0#error-handling | java.io.IOException: Connection closed (RxJavaPlugins.java:367 CompletableCreate.java:77 RxJavaStreams.java:174 LdapResponseMessageWriter.java:79 LdapResponseMessageWriter.java:68 AsyncQueueRecord.java:110 TaskQueue.java:336 AbstractNIOAsyncQueueWriter.java:501 TCPNIOTransport.java:403 NIOConnection.java:666 NIOConnection.java:632 DefaultSelectorHandler.java:237 NIOConnection.java:626 TCPNIOConnection.java:291 NIOConnection.java:586 NIOConnection.java:582 AsyncWriteQueueRecord.java:173 TCPNIOAsyncQueueWriter.java:307 TCPNIOAsyncQueueWriter.java:205 TCPNIOAsyncQueueWriter.java:92 AbstractNIOAsyncQueueWriter.java:344 ...)