In non-anonymous Jabber rooms, using the full Jabber ID as nick will result in "broken" highlights

[matrixagent]

When one joins a non-anonyomus Jabber room, the participant list of the corresponding bitlbee IRC channel will use the full jabber ids of the users in that room as a basis for their nicks. However, Jabber rooms generally make use of the feature that people can specify their nick for that very room when joining it. Usually, Jabber clients therefore rely on people being highlighted via that specific username, not the pre-@-part of their real Jabber ID. As a bitlbee user, one constantly sends "weird"/unknown/unused nicknames as tab-completed highlighters from the perspective of "normal" Jabber users.

[wilmer]

#415.