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Actually, it does. It's one of the first things that happens in actionInstallFromArchive() via canInstallFromArchive() in the AddOn repo.

Although we could list it in the server environment report, we decided not to as it may not be relevant to everyone, and you become aware of the requirement when attempting to use the feature anyway.

Even if that wasn't a conscious decision, that would hardly be considered as a bug.

EDIT: We've added the ZipArchive indication in the server environment report now regardless.