The fix for this test error: https://treeherder.mozilla.org/logviewer?job_id=360150226&repo=autoland&lineNumber=2807 is what caused this regression. One possibility is that backing out that fixing and changing the test instead would be a good solution. It depends in part on how we decide to solve bug 1744951.
Bug 1744888 Comment 2 Edit History
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The fix for this test error: https://treeherder.mozilla.org/logviewer?job_id=360150226&repo=autoland&lineNumber=2807 is what caused this regression. One possibility is that backing out that fix and changing the test instead would be a good solution. It depends in part on how we decide to solve bug 1744951.