When you connect to libera.chat #guile you have the following welcome message:
The topic for #guile is: Welcome to #guile. See https://gnu.org/s/guile for more information. Latest stable release is Guile 3.0.11 <https://www.gnu.org/software/guile/news/gnu-guile-3011-released.html>;. This channel is logged, see <http://logs.guix.gnu.org/guile/>;. Bug database at <https://codeberg.org/guile/guile/issues>;..
Urls inside brackets are incorrectly parsed.
https://bugzilla.mozilla.org/show_bug.cgi?id=954848