我使用wechatpay-php开发 商户订单号查询订单

代码如下：

    // 设置参数

    // 商户号
    $merchantId = 'XXXX98216';

    // 从本地文件中加载「商户API私钥」，「商户API私钥」会用来生成请求的签名
    //file_get_contents是自己加的
    $merchantPrivateKeyFilePath = file_get_contents('E:\fund\apiclient_key.pem');
    $merchantPrivateKeyInstance = Rsa::from($merchantPrivateKeyFilePath, Rsa::KEY_TYPE_PRIVATE);

    // 「商户API证书」的「证书序列号」
    $merchantCertificateSerial = 'XXXX4CBC872A7C76329583239D3';

    // 从本地文件中加载「微信支付平台证书」，用来验证微信支付应答的签名
    $platformCertificateFilePath = file_get_contents('E:\fund\vendor\wechatpay\wechatpay\wechatXXXF3AB3FDFEA4696E95432A9BCD3D7.pem');
    $platformPublicKeyInstance = Rsa::from($platformCertificateFilePath, Rsa::KEY_TYPE_PUBLIC);

    // 从「微信支付平台证书」中获取「证书序列号」
    $platformCertificateSerial = PemUtil::parseCertificateSerialNo($platformCertificateFilePath);

    // 构造一个 APIv3 客户端实例
    $instance = Builder::factory([
        'mchid' => $merchantId,
        'serial' => $merchantCertificateSerial,
        'privateKey' => $merchantPrivateKeyInstance,
        'certs' => [
            $platformCertificateSerial => $platformPublicKeyInstance,
        ],
    ]);

    try {

        // 打印订单号，确保其正确性
        echo "out_trade_no: " . $out_trade_no . PHP_EOL;

        $resp = $instance
            ->chain("v3/pay/transactions/out-trade-no/$out_trade_no")
            ->get(['query' => [
                'mchid' => $merchantId,
            ]]);

        echo $resp->getStatusCode(), PHP_EOL;
        echo $resp->getBody(), PHP_EOL;
        return $resp->getBody();
    } catch (\Exception $e) {
        // 进行错误处理
        echo $e->getMessage(), PHP_EOL;
        if ($e instanceof \GuzzleHttp\Exception\RequestException && $e->hasResponse()) {
            $r = $e->getResponse();
            echo $r->getStatusCode() . ' ' . $r->getReasonPhrase(), PHP_EOL;
            echo $r->getBody(), PHP_EOL, PHP_EOL, PHP_EOL;
        }
        echo $e->getTraceAsString(), PHP_EOL;
    }

报错：

out_trade_no: O7291660515080d1722216605

Client error: `GET https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/-o7291660515080d1722216605?mchid=1682098216` resulted in a `404 Not Found` response:

{"code":"ORDER_NOT_EXIST","message":"订单不存在"}

为啥订单前面非要自动加-