Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Interestingly, this older icecat in my store, at version 102.7.0 didn't
> have that problem:

You can bisect this by using
https://data.guix.gnu.org/repository/1/branch/master/package/icecat/output-history

I see this problem start to happen with
/gnu/store/2a67f3c5lv14bq11vyyb6k2z2aw457nk-icecat-102.8.0-guix0-preview1

So it's probably these changes here
https://data.guix.gnu.org/compare?base_commit=636b771536b95d15a2fd68b468deeebac97d6bee&target_commit=d318ccc36308171a74b4863ea25a3dded05a2851