Still trying to reproduce this by combining gray marking and wrapper remapping, but no luck yet. Gray marking had to be done carefully: just because an entry has been marked gray, it doesn't mean you can forget about it, because it might need to later be "upgraded" to black.
Bug 1658654 Comment 6 Edit History
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Still trying to reproduce this by combining gray marking and wrapper remapping, but no luck yet. Gray marking had to be done carefully: just because an entry has been marked gray, it doesn't mean you can forget about it, because it might need to later be "upgraded" to black. (Oops; committed earlier than intended.) But that logic checks out.