Oh and looks like this task *used* to fail, at least as recently as Julien's try push from comment 1. So that supports the theory that an L3 image update might fix this.
Bug 1795884 Comment 5 Edit History
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Oh and looks like this task *used* to fail on try, at least as recently as Julien's try push from comment 1. So that supports the theory that an L3 image update might fix this (since L1 images have been updated since then but L3 images have not).