Wikidata Smoketest Headless: XHR didn't load. Or at least that is the guess. Happens on both headless and saucelabs.
http://raita.wmflabs.org/#projects/https%3A%2F%2Fgithub.com%2Fwmde%2FWikidataBrowserTests.git/builds/WcP1rYJRS2OYWSpCfrv9qw
https://integration.wikimedia.org/ci/job/browsertests-Wikidata-SmokeTests-linux-firefox-sauce/427/artifact/log/Edit_sitelinks%3A_Save_sitelink%3A_|_click_the_sitelink_save_button_|.png
http://raita.wmflabs.org/#projects/https%3A%2F%2Fgithub.com%2Fwmde%2FWikidataBrowserTests.git/builds/06Yw6dQIRN2R060ouXJU3Q
(https://saucelabs.com/jobs/a5afc57753dd431ea0fc230db74f51e5)
Feature: Edit sitelinks Scenario Outline: Save sitelink
The save link doesn't activate.
Maybe XHR failed to load?