I have added the retries on stale elements and changed the page object in some cases to make it robust against elements being added/removed at the same time. For the suggested change of the production code to avoid changing the HTML elements I've opened XWIKI-24648 and a corresponding PR. After applying the changes for this issue, the flickering seems to have stopped: As of now, the last failure was 5.2 days ago (before the fix) with 78 clean runs since then. I'm therefore closing this. If this should fail again, I think a new issue should be opened as it is likely that the new failure reason is not the same as what was discussed and fixed for this issue.
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