It seems this is not happening anymore: https://treeherder.mozilla.org/#/jobs?repo=try&revision=9706c741657a77c2a754da620a3ec27ed37d9bdf&selectedJob=283042271 However, there other failures that can be hiding it.
Bug 1604047 Comment 6 Edit History
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It seems this is not happening anymore: https://treeherder.mozilla.org/#/jobs?repo=try&revision=9706c741657a77c2a754da620a3ec27ed37d9bdf&selectedJob=283042271 However, there are other failures that can be hiding it.