ECDH keys not working very well on sync

[notasecret]

To repro:
Switch test org to use ECDH 256,

Then run sync test,

Note that this error happens:

Test Case '-[Peacemakr_iOS_Tests.SDKIntegrationTests testEncryptDecrypt]' started.
Test Org API Key:  Btc+XtUWde6/fWhJPFTN3nch+8+B5ADhi88HN4BTCcA= nil
Test Case '-[Peacemakr_iOS_Tests.SDKIntegrationTests testEncryptDecrypt]' passed (170.804 seconds).
Test Case '-[Peacemakr_iOS_Tests.SDKIntegrationTests testRegister]' started.
Test Org API Key:  Btc+XtUWde6/fWhJPFTN3nch+8+B5ADhi88HN4BTCcA= nil
no error
Test Case '-[Peacemakr_iOS_Tests.SDKIntegrationTests testRegister]' passed (0.711 seconds).
Test Case '-[Peacemakr_iOS_Tests.SDKIntegrationTests testSync]' started.
Test Org API Key:  Btc+XtUWde6/fWhJPFTN3nch+8+B5ADhi88HN4BTCcA= nil
no error
symmetric_decrypt: 197 - error:00000000:lib(0):func(0):reason(0)

When running this blob:

          // If ECDH then do the keygen
          var decryptKey: PeacemakrKey
          if myPrivKey.getConfig().asymmCipher.rawValue >= AsymmetricCipher.ECDH_P256.rawValue {
            guard let ecdhKey = PeacemakrKey(symmCipher: deserializedCfg.1.symmCipher, myKey: myPrivKey, peerKey: pKey!) else {
              Logger.error("Unable to perform ECDH Keygen")
              completion(NSError(domain: "Unable to perform ECDH Keygen", code: -12, userInfo: nil))
              return
            }
            decryptKey = ecdhKey
          } else {
            decryptKey = myPrivKey
          }

And then the key failed to decrypt the downloaded ciphertext of the delivered keys for a sync. Or maybe no client key updates work.

Happens only after loading Simulator with one set of keys, and switching the client config from RSA -> ECDH.