Old irc session hangs after disconnect, double messages observed

[rvstaveren]

After a purported disconnect of the irc bridge with the OFTC network somewhere around 14/15 september I’m having the following issues using the OFTC bridge:

• my old nick (guur[m]) is still there, and doesn’t disconnect. /msg the nick doesn’t result in a message in element. That nick’s session didn’t timeout
• My new session can’t change the nick to the old nickname as it is in use, but somehow messages seen by the old and new nick end up in element…

Information about the sessions. The guur[m] is the nick that is no longer reachable by the matrix irc bridge

…
17:18 [ZNCOFTC] -!-    REDACTED ruben[m]  H+  2  ~rubenverw@2001:470:1af1:101::edea [com.verweg:ruben]
…
17:18 -!- ruben[m] [~rubenverw@2001:470:1af1:101::edea]
17:18 -!-  ircname  : com.verweg:ruben
17:18 -!-  channels : REDACTED
17:18 -!-  server   : helix.oftc.net [Umeå, Sweden]
17:18 -!-  hostname : 2001:470:1af1:101::edea 
17:18 -!- End of WHOIS
17:18 [ZNCOFTC] -!-    REDACTED guur[m]   H+  2  ~rubenverw@2001:470:1af1:101::edea [com.verweg:ruben]
…
17:18 [ZNCOFTC] -!- guur[m] [~rubenverw@2001:470:1af1:101::edea]
17:18 [ZNCOFTC] -!-  ircname  : com.verweg:ruben
17:18 [ZNCOFTC] -!-  channels : REDACTED
17:18 [ZNCOFTC] -!-  server   : kinetic.oftc.net [London, United Kingdom]
17:18 [ZNCOFTC] -!-  hostname : 2001:470:1af1:101::edea 
17:18 [ZNCOFTC] -!- End of WHOIS
…

The duplicate message issue. Posting with my irssi session…

Seeing it in the element session

Tried to restart my home server (synapse) to dislodge that session was to no effect. It looks like that session is stuck in the irc bridge.

Unfortunately I’m in the dark on how the disconnect between matrix/irc happened so I’m not able to describe how to reproduce it. There might be something visible in the logs though, if any