Throws errors loading old logs

[hadess]

telepathy-logger throws errors loading old logs because it uses libxml2 to read the logs, but a version of GMarkup to save them:

.local/share/TpLogger/logs/idle_irc_hadess2/chatrooms/#control-center/20210522.log:204: parser error : xmlParseCharRef: invalid xmlChar value 7
x7;CHANNEL HAS MOVED TO IRC.LIBERA.CHAT #HAMRADIO 
                                                                               ^

Reproducer file and analysis here:
https://gitlab.gnome.org/GNOME/polari/-/issues/183