Fatal Error on editting Financial Transaction

In 5.3.0 tested on Dev site and civicrmfr.org demo

1. Create a completed contribution.
2. Edit contribution by increasing contribution amount and net amount. This will create a new financial transaction with NO Payment Instrument.
3. Edit new Financial Transaction to add Payment Instrument. Click Update - Get Spinning Logo Error

ConfigAndLog Records this error.

$Fatal Error Details = array(3) {
  ["message"]=>
  string(65) "Mandatory key(s) missing from params array: payment_instrument_id"
  ["code"]=>
  NULL
  ["exception"]=>
  object(CiviCRM_API3_Exception)#323 (8) {
    ["extraParams":"CiviCRM_API3_Exception":private]=>
    array(6) {
      ["fields"]=>
      array(1) {
        [0]=>
        string(21) "payment_instrument_id"
      }
      ["error_code"]=>
      string(17) "mandatory_missing"
      ["entity"]=>
      string(13) "FinancialTrxn"
      ["action"]=>
      string(6) "create"
      ["is_error"]=>
      int(1)
      ["error_message"]=>
      string(65) "Mandatory key(s) missing from params array: payment_instrument_id"
    }
    ["message":protected]=>
    string(65) "Mandatory key(s) missing from params array: payment_instrument_id"
    ["string":"Exception":private]=>
    string(0) ""
    ["code":protected]=>
    int(0)
    ["file":protected]=>
    string(65) "/server/public_html/sites/all/modules/civicrm/api/api.php"
    ["line":protected]=>
    int(45)
    ["trace":"Exception":private]=>
    array(15) {
      [0]=>
      array(4) {
        ["file"]=>
        string(88) "/server/public_html/sites/all/modules/civicrm/CRM/Financial/Form/PaymentEdit.php"
        ["line"]=>
        int(207)
        ["function"]=>
        string(12) "civicrm_api3"
        ["args"]=>
        array(3) {
          [0]=>
          string(13) "FinancialTrxn"
          [1]=>
          string(6) "create"
          [2]=>
          array(9) {
            ["to_financial_account_id"]=>
            string(2) "23"
            ["trxn_date"]=>
            string(19) "2018-07-16 17:23:00"
            ["total_amount"]=>
            float(-10)
            ["fee_amount"]=>
            float(0)
            ["net_amount"]=>
            float(-10)
            ["currency"]=>
            string(3) "USD"
            ["is_payment"]=>
            string(1) "1"
            ["status_id"]=>
            string(1) "1"
            ["contribution_id"]=>
            string(5) "30997"
          }
        }
      }
      [1]=>
      array(6) {
        ["file"]=>
        string(88) "/server/public_html/sites/all/modules/civicrm/CRM/Financial/Form/PaymentEdit.php"
        ["line"]=>
        int(175)
        ["function"]=>
        string(6) "submit"
        ["class"]=>
        string(30) "CRM_Financial_Form_PaymentEdit"
        ["type"]=>
        string(2) "->"
        ["args"]=>
        array(1) {
          [0]=>
          array(4) {
            ["id"]=>
            string(5) "39513"
            ["payment_instrument_id"]=>
            string(1) "3"
            ["trxn_id"]=>
            string(0) ""
            ["trxn_date"]=>
            string(19) "2018-07-16 17:23:00"
          }
        }
      }