Keystore parsing to obtain privatekey error

[YLeaves]

Hello! I tested a json recovery and found that the private key is incomplete and only 26 bytes long.

let password = "12345678"
let jsonStr = "{"crypto":{"cipher":"aes-128-ctr","cipherparams":{"iv":"2670bec226095538fd44b50807a139d9"},"ciphertext":"50e9f70d396c8c0b7be1340673044fd78dfd493b19f746e14723222e395dc642","kdf":"pbkdf2","kdfparams":{"c":10240,"dklen":32,"prf":"hmac-sha256","salt":"efdcd42c943a035377aaa481eb6dd33804a4c1b1fb392abf8aaa17695c672497"},"mac":"25201baf9cd2223580b8c393bdb5cfaa804c4daae2726e87bf053f9fca5563df"},"id":"c469d83a-378e-4470-94f0-81b663e39e19","version":3,"address":"9187e0a616a1a369ce6ca91d1026ec3583173d8a"}"

let jsonData = Data(jsonStr.utf8);
let keystore = try? JSONDecoder().decode(Keystore.self, from: jsonData)
let private = try? keystore?.privateKey(password:password )
let privateKey = private!.toHexString()
//print data
//privateKey：e8d90e0aae25d4e1523636cefd6f519856c4d99a57b4e046e540

Correct data
//privateKey：e8d90e0aae25d4e1523636cefd6f519856c4d99a57b4e046e5400e5c8b9f9506
//mnemonic：furnace vanish vicious misery very visual practice middle lonely actress speak zone