Presence and IQ responses not recognized in Multi-User-Chat

Bug appears when entering chat room. Debug log (JIDs redacted) shows the presence stanza is received, but it doesn't seem to be recognized:

OUT: <presence to="lobby@conference.example.com/bot"><x xmlns="http://jabber.org/protocol/muc"></x></presence>
[...]
IN : <presence from="lobby@conference.example.com/bot" to="user@example.com/bot"><x xmlns="http://jabber.org/protocol/muc#user"><item affiliation="none" jid="user@example.com/bot" role="participant"></item></x></presence>
[...]

After a short time this exception is thrown:

rocks.xmpp.core.session.NoResponseException: Timeout reached, while waiting on a response.
    at rocks.xmpp.core.session.XmppSession.sendAndAwaitPresence(XmppSession.java:597)
    at rocks.xmpp.core.session.XmppSession.sendAndAwaitPresence(XmppSession.java:556)
    at rocks.xmpp.extensions.muc.ChatRoom.enter(ChatRoom.java:409)
    at rocks.xmpp.extensions.muc.ChatRoom.enter(ChatRoom.java:356)

The IQ stanzas aren't recognized either, leading to multiple of these:

Jan 22, 2015 8:43:37 AM rocks.xmpp.extensions.caps.EntityCapabilitiesManager$3 handle
Warnung: Timeout reached, while waiting on a response.
rocks.xmpp.core.session.NoResponseException: Timeout reached, while waiting on a response.
    at rocks.xmpp.core.session.XmppSession.sendAndAwaitIQ(XmppSession.java:531)
    at rocks.xmpp.core.session.XmppSession.query(XmppSession.java:472)
    at rocks.xmpp.core.session.XmppSession.query(XmppSession.java:452)
    at rocks.xmpp.extensions.disco.ServiceDiscoveryManager.discoverInformation(ServiceDiscoveryManager.java:382)
    at rocks.xmpp.extensions.caps.EntityCapabilitiesManager$3.handle(EntityCapabilitiesManager.java:180)
    at rocks.xmpp.extensions.caps.EntityCapabilitiesManager$3.handle(EntityCapabilitiesManager.java:136)
    at rocks.xmpp.core.session.XmppSession.notifyStanzaListeners(XmppSession.java:407)
    at rocks.xmpp.core.session.XmppSession.access$600(XmppSession.java:80)
    at rocks.xmpp.core.session.XmppSession$9.run(XmppSession.java:961)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)

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