I have seen 2 packages that use webkitgtk fail their tests on Ubuntu 19.04's ppc64el and s390x after we upgraded webkitgtk from 2.23.91 to 2.23.92. We also switched from cmake+make to cmake+ninja in this update as a workaround for https://bugs.webkit.org/show_bug.cgi?id=195251 . https://autopkgtest.ubuntu.com/packages/s/sphinx/disco/ppc64el https://autopkgtest.ubuntu.com/packages/s/sphinx/disco/s390x with .91: https://launchpadlibrarian.net/414249256/buildlog_ubuntu-disco-s390x.geary_0.13.2-0.1_BUILDING.txt.gz with .92: https://launchpadlibrarian.net/414161288/buildlog_ubuntu-disco-s390x.geary_0.13.2-0.1_BUILDING.txt.gz (Specifically, geary's client-tests fails with .92.) The sphinx test is defined at https://salsa.debian.org/python-team/modules/sphinx/blob/debian/master/debian/tests/sphinx-doc
I did a rebuild without cmake+ninja and had the same problems with the geary and sphinx tests.