I see some reports of broken schemas after upgrading to 2.12.0, we currently have 2.11.7 so it matches in that sense. The supposed change is https://gitlab.gnome.org/GNOME/libxml2/-/commit/a06eaa6119ca5b296b8105dc8c9a.... There are only two patterns in our xsd, but I don't know exactly what's going on there.