updated RefreshTokenGrant.php:respondToAccessTokenRequest

RefreshTokenGrant.php

$newScopes = array();
$newScopesIdentifiers = array();

foreach ($scopes as $scope) {
      if (in_array($scope->getIdentifier(), $oldRefreshToken['scopes'])) {
          array_push($newScopes, $scope);
          array_push($newScopesIdentifiers, $scope->getIdentifier());
      }
}

...
$accessToken = $this->issueAccessToken($accessTokenTTL, $client, $oldRefreshToken['user_id'], $newScopes);
...
$responseType->setTokenScopes($newScopesIdentifiers);
...