Upstream does not have valid appstream file.
https://bugs.gentoo.org/939377
--- a/data/meson.build
+++ b/data/meson.build
@@ -20,10 +20,6 @@ appstream_file = i18n.merge_file(
   install_dir: join_paths(get_option('datadir'), 'metainfo')
 )
 
-appstream_util = find_program('appstream-util', required: false)
-if appstream_util.found()
-  test('Validate appstream file', appstream_util, args: ['validate', appstream_file])
-endif
 
 install_data('io.missioncenter.MissionCenter.gschema.xml',
   install_dir: join_paths(get_option('datadir'), 'glib-2.0/schemas')