Invalid JID in disco#items

[Zash]

Service discovery listing on xmpp:matrix.org lists a room with a JID containing two @ signs. According to the RFC on XMPP Addresses, this is not valid, as explicitly stated in §3.3.1.

If Matrix allows @ signs in localparts then these will need to be escaped, e.g. using XEP-0106.

To reproduce

Send:
<iq to='matrix.org' type='get' id='9b922d3a-251c-4edb-b1ca-d27793126866' xml:lang='en'>
  <query xmlns='http://jabber.org/protocol/disco#items'/>
</iq>

Receive:
<iq from='matrix.org' type='result' id='9b922d3a-251c-4edb-b1ca-d27793126866' xml:lang='en'>
  <query xmlns='http://jabber.org/protocol/disco#items'>
    <item jid='#_twitter_@lvv2com#matrix.org@matrix.org' name='[Twitter] 今日热点'/>
    <!-- other items removed for brevity -->
  </query>
</iq>