cannot enable stream management

Unfortunately I seem to be unable to enable stream management using babbler 0.8.2. This is the client code I tried:

    public static void main(String[] args) {
        // Create a "main application" thread, which keeps the JVM running.
        Executors.newFixedThreadPool(1).execute(() -> {
            try {
                XmppSessionConfiguration configuration = XmppSessionConfiguration.builder()
                        .debugger(ConsoleDebugger.class)
                        .authenticationMechanisms("PLAIN")
                        .build();

                SocketConnectionConfiguration socketConnectionConfiguration = SocketConnectionConfiguration.builder()
                        .hostname("xmpp.mydomain.org") // The hostname.
                        .port(5223) // The XMPP default port.
                        .sslContext(getTrustAllSslContext()) // Use an SSL context, which trusts every server. Only use it for testing!
                        .channelEncryption(ChannelEncryption.DIRECT)
                        .hostnameVerifier((s, sslSession) -> true)
                        .build();

                XmppClient xmppClient = XmppClient.create("mydomain.org", configuration, socketConnectionConfiguration);
                xmppClient.addInboundMessageListener(e -> onMessageReceived(e.getMessage()));
                xmppClient.enableFeature(StreamManagement.NAMESPACE);

                xmppClient.connect();
                xmppClient.login("testuser", "testpass");
                xmppClient.enableFeature(StreamManagement.NAMESPACE);


                SendTask<Message> trackableMessage = xmppClient.sendMessage(new Message(Jid.of("testuser2@mydomain.org"), Message.Type.CHAT, "Hello World! öäü!"));
                trackableMessage.onAcknowledge(message -> System.out.println("Received by server: " + message));

            } catch (XmppException | GeneralSecurityException e) {
                throw new RuntimeException(e);
            }
        });
    }

Result is like that:

‌

OUT (null): <?xml version='1.0' encoding='UTF-8'?><stream:stream xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" to="mydomain.org" version="1.0" xml:lang="de-DE">
IN  (9974650222920354814): <?xml version='1.0'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" id="9974650222920354814" version="1.0" xml:lang="de-DE" from="mydomain.org">
IN  (9974650222920354814): <stream:features><mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl"><mechanism>PLAIN</mechanism><mechanism>X-OAUTH2</mechanism></mechanisms></stream:features>
OUT (9974650222920354814): <auth xmlns="urn:ietf:params:xml:ns:xmpp-sasl" mechanism="PLAIN">xxx</auth>
IN  (9974650222920354814): <success xmlns="urn:ietf:params:xml:ns:xmpp-sasl"/>
OUT (9974650222920354814): <?xml version='1.0' encoding='UTF-8'?><stream:stream xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" to="mydomain.org" version="1.0" xml:lang="de-DE">
IN  (17268390180692473667): <?xml version='1.0'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" id="17268390180692473667" version="1.0" xml:lang="de-DE" from="mydomain.org">
IN  (17268390180692473667): <stream:features><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"/><session xmlns="urn:ietf:params:xml:ns:xmpp-session"><optional></optional></session><c xmlns="http://jabber.org/protocol/caps" hash="sha-1" node="http://www.process-one.net/en/ejabberd/" ver="/uPYvrXxtAa5yoXZtMivQjUJtzY="/><sm xmlns="urn:xmpp:sm:2"/><sm xmlns="urn:xmpp:sm:3"/><ver xmlns="urn:xmpp:features:rosterver"/><csi xmlns="urn:xmpp:csi:0"/></stream:features>
OUT (17268390180692473667): <iq id="d58927df-3a32-43fd-8e8d-9d098bf1cfe4" type="set"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"/></iq>
IN  (17268390180692473667): <iq id="d58927df-3a32-43fd-8e8d-9d098bf1cfe4" type="result"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><jid>testuser@mydomain.org/130473234291349871607586</jid></bind></iq>
OUT (17268390180692473667): <iq id="bb683b12-71b7-4f09-8a7f-d81a30717375" type="get"><query xmlns="jabber:iq:roster" ver="554bfd63109558f526891ca71132c59c3f117035"/></iq>
IN  (17268390180692473667): <iq from="testuser@mydomain.org" id="bb683b12-71b7-4f09-8a7f-d81a30717375" to="testuser@mydomain.org/130473234291349871607586" type="result" xml:lang="de-DE"/>
OUT (17268390180692473667): <presence><c xmlns="http://jabber.org/protocol/caps" hash="sha-1" node="http://xmpp.rocks" ver="5oTzv8QBN75AN//rQSO4V/GZkjQ="/><c xmlns="urn:xmpp:caps"><hash xmlns="urn:xmpp:hashes:2" algo="sha-256">OlWsYzO1m+iaGJKMopKc+WyRftg+X92YZyCUJRxXUF8=</hash></c></presence>
OUT (17268390180692473667): <message to="testuser2@mydomain.org" type="chat"><body>Hello World! öäü!</body></message>
IN  (17268390180692473667): <presence from="testuser@mydomain.org/130473234291349871607586" to="testuser@mydomain.org/130473234291349871607586" xml:lang="de-DE"><c xmlns="http://jabber.org/protocol/caps" hash="sha-1" node="http://xmpp.rocks" ver="5oTzv8QBN75AN//rQSO4V/GZkjQ="/><c xmlns="urn:xmpp:caps"><hash xmlns="urn:xmpp:hashes:2" algo="sha-256">OlWsYzO1m+iaGJKMopKc+WyRftg+X92YZyCUJRxXUF8=</hash></c><x xmlns="vcard-temp:x:update"/></presence>

‌

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