Wrong encryption key returned for previous eons

[ylembachar]

Decryption across eons works but requires the previous eon to encrypt, which is not provided by the Shutter API - see below encryption data for an identity prefix used and registered within eon 8:

{
  "message": {
    "eon": 9,
    "identity": "0xf84f5007dbe39b980f43de828c40b85b8608ffe2f500e4fb5de9a1b0dfbfd2cf",
    "identity_prefix": "0x79bc8f6b4fcb02c771d6a702b7ad965c7fca19e94a9646d21ae90c8b54c030a0",
    "eon_key": "0xa59ff5763b605c34d174890f879a069cd7737083bef43b2288a200552c057769131fafd0c714176bf696689bfa11cd2e08eff6ba93d37e3cef3845f3aa1746dafeac8d062c0070d369ccfca1c1da4794fbf427f271754b2099f634ed21b0cd96",
    "epoch_id": "0x89d02bc74a766b4540c43d1f8d2fc09dc8cafb4bc3714f86a22b7c3afbfc9746ee81d152d6293c406d240a60e4b0180a"
  }
}