Example for the failure: https://integration.wikimedia.org/ci/job/mwselenium-quibble-docker/12589/console (from https://gerrit.wikimedia.org/r/510485).
Relevant snippet from the error message:
… error: Element <input … value="Save changes" … is not clickable … Other element would receive the click: <div class="… ve-init-mw-welcomeDialog …