See the failures on https://gerrit.wikimedia.org/r/#/c/399914/.
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I don’t think this is the same error as T189329: jquery.wikibase qunit tests are flaky (Pending Ajax requests), our selenium tests have been flaky for a lot longer than the qunit stuff (but that only affects Wikibase and not other extensions). But since the Jenkins log of https://gerrit.wikimedia.org/r/#/c/399914/ is no longer available, I can’t verify that this is about the same errors that I was thinking of. @Tgr do you remember what the log looked like? If it looked like P6864 (copied from this build) then I think it’s not the same error.