You are right, this was caused by bug 1513095.
Bug 1530423 Comment 2 Edit History
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You are right, this was caused by bug 1513095 instead. I should have rechecked. With mozregression I get https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=daf05866f9ddcd5a362b4d436477f3e01abd4234&tochange=957cc2dce89c9c93265bb24445792eb46fc24d4e