test that unknown zones don't store mapping keys
test that unknown zones don't store mapping keys

[#4942]

Signed-off-by: Santiago Pastorino <792d28329de7ed446c01b83f731a071248ffeaf4@wyeworks.com>
Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>

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