This is still occurring on the merge with the fix https://treeherder.mozilla.org/#/jobs?repo=mozilla-inbound&resultStatus=testfailed%2Cbusted%2Cexception&classifiedState=unclassified&selectedJob=252977715
Bug 1553046 Comment 21 Edit History
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This is still occurring on the merge with the fix https://treeherder.mozilla.org/#/jobs?repo=mozilla-inbound&selectedJob=252977715&resultStatus=testfailed%2Cbusted%2Cexception