We also have this kind of failures: https://treeherder.mozilla.org/logviewer?job_id=385570719&repo=try Might not be perma only on beta-simulation(present on central too), we have bug 1781555 for that if you want to take a look.
Bug 1781776 Comment 1 Edit History
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We also have this kind of failures: https://treeherder.mozilla.org/logviewer?job_id=385570719&repo=try This is perma on central too, we have bug 1781555 for that if you want to take a look.