This bug is truly old. This is the bisection range I got with the testcase in comment #22 : https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=db78be8dbc1c81844eb7d35c1a3073078eb5d923&tochange=89d79c2258be1c420153e1adc54338b0165fc88e
Bug 1927714 Comment 23 Edit History
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This bug is truly old. This is the bisection range I got with the testcase in comment #22 : https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=db78be8dbc1c81844eb7d35c1a3073078eb5d923&tochange=89d79c2258be1c420153e1adc54338b0165fc88e so maybe bug 1464428?