sign-tx function sign transaction incorrectly.

[tunghm-ibl]

My version:
PLUGIN_VERSION="0.2.7"
VAULT_VERSION="1.4.0"

I use api https://localhost:8200/v1/ethereum/accounts/operator/sign-tx to sign my transaction.

Response:
{
"request_id": "44363911-657f-de63-b84b-2134dacd1d63",
"lease_id": "",
"renewable": false,
"lease_duration": 0,
"data": {
"address_from": "0x429eb0be5f2e874cedefcce53b5b20d411b8e89a",
"address_to": "0x36d1f896E55A6577C62fdd6B84fbf74582266711",
"amount": "0",
"amount_in_usd": "0",
"gas_limit": "21000",
"gas_price": "20000000000",
"signed_transaction": "0xf864808504a817c8008252089436d1f896e55a6577c62fdd6b84fbf7458226671180801ca036ebd7874b62feb46480a2bb2ea52ad2f6a7a2bd376038d2d283644918053f3ea03de93f716c367a8f4ac478da0e88c9cfdbd2d37175857aa8a24bfb4b27d17c92",
"starting_balance": 10000000000000000000,
"starting_balance_in_usd": "0",
"total_spend": "0",
"transaction_hash": "0xe71c3b8075228e49a4a7bf90a3571e04efad72daedb80662a431033cc55098af"
},
"wrap_info": null,
"warnings": null,
"auth": null
}

But this result is incorrect. My testing:
const EthTx = require('ethereumjs-tx')
cont sender = new EthTx(signed_transaction).getSenderAddress().toString('hex')
// sender is 0x1b82c7572e2efb8291e4d2b2d3a279fc384555c2 not match address_from.