Parity Aura - Error: EVM ha revertido la transacción

Ejecuto el siguiente código contra dos cadenas de bloques privadas, parity-aura y geth-clique. ¿Por qué la transacción de paridad se revierte y por qué usa 6,000,000 de gas cuando en realidad solo debería usar alrededor de 44709 de gas?

Código JS

contract = new web3.eth.Contract(KVStoreABI);
contract.options.address = contractAddress;
tx = contract.methods.set("hello", "world");
tx.send({ "from": fromAddress })
        .once('transactionHash', function (hash) {
            console.log("TX RECEIVED:", hash)
        })
        .once('receipt', function (receipt) {
            console.log("RECEIPT:\n", receipt)
        })
        .on('error', function (error) {
            console.log("ERROR\n:", error)
        })
        .then(function (receipt) {
            console.log("TX MINED:", receipt.transactionHash)
        });

kvstore.sol

pragma solidity ^0.5.7;

contract KVstore {

  mapping(string=>string) public store;

  function get(string memory key) public view returns(string memory) {
    return store[key];
  }
  function set(string memory key, string memory value) public {
    store[key] = value;
  }
}

Paridad-Aura

Contract at: 0xd653D36C16c01dC6c0802B571Bb4B129A2Cb2CD7
Sending  1txs...

TX RECEIVED: 0x0d5e8b19a8706bf2f1e1c46e35081353e140d5a0b608c0b65aae6225cd41a8b3
(node:29273) UnhandledPromiseRejectionWarning: Error: Transaction has been reverted by the EVM:
{
  "blockHash": "0xa1ef20cfdb0790d3fa00420cd892e7cfd59e013c45cd794d0766f8f076e54ff6",
  "blockNumber": 20,
  "contractAddress": null,
  "cumulativeGasUsed": 6000000,
  "from": "0x933e73c3f959759c169effa4019c8faf7d05ce33",
  "gasUsed": 6000000,
  "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "root": null,
  "status": false,
  "to": "0xd653d36c16c01dc6c0802b571bb4b129a2cb2cd7",
  "transactionHash": "0x0d5e8b19a8706bf2f1e1c46e35081353e140d5a0b608c0b65aae6225cd41a8b3",
  "transactionIndex": 0,
  "events": {}
}
at /home/ubuntu/node_modules/web3-core-method/src/index.js:412:37
at processTicksAndRejections (internal/process/task_queues.js:93:5)

Camarilla Geth

Contract at: 0x4032E20ea7bb7F1F9dA448D661B3B27EcbCa9DFd
Sending  1txs...

TX RECEIVED: 0x0d7766a5eab1fa3220c9401dc74444360653932fa467941b3e38e033aca132ad
RECEIPT:
 {
  blockHash: '0x177e9d9c12bdfc8cfa895e7bc545e801baca1310e2637637d9dd3afd8a31e063',
  blockNumber: 326,
  contractAddress: null,
  cumulativeGasUsed: 44709,
  from: '0x933e73c3f959759c169effa4019c8faf7d05ce33',
  gasUsed: 44709,
  logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
  status: true,
  to: '0x4032e20ea7bb7f1f9da448d661b3b27ecbca9dfd',
  transactionHash: '0x0d7766a5eab1fa3220c9401dc74444360653932fa467941b3e38e033aca132ad',
  transactionIndex: 0,
  events: {}
}
TX MINED: 0x0d7766a5eab1fa3220c9401dc74444360653932fa467941b3e38e033aca132ad