@firebase/firestore: Firestore (7.16.0): Connection GRPC stream error. Code: 1 Message: 1 CANCELLED: The operation was cancelled

I have the following webhook, and it is listening for a payment provider API to update the status of an order once it is 'paid'. In logs for Firebase Functions, I get the console log Payment status paid meaning that I get the update of the order correctly. However, when I try to call the function responsible for updating Firestore, I get the following:

@firebase/firestore: Firestore (7.16.0): Connection GRPC stream error. Code: 13 Message: 13 INTERNAL: Received RST_STREAM with code 2

exports.webhooks = functions.https.onRequest(function (req, res) {
  mollieClient.payments
    .get(req.body.id)
    .then((payment) => {
      console.log("Payment status " + payment.status);

      if (payment.isPaid()) {
        updateOrderStatusPaid(req.body.id);
        return null;
      }
      return null;
    })
    .catch((error) => {
      res.send(error);
    });
  console.log("Request body " + req.body);
});

function updateOrderStatusPaid(orderId) {
  firebase
  .firestore()
  .collection("orders")
  .where("paymentId", "==", orderId)
  .update({
    status: payment.status
  })
  .then(function () {
    console.log("Success");
    return null;
  })
  .catch(function (error) {
    console.log("Error " + error);
  });
}

Here is my package.json file

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "lint": "eslint .",
    "serve": "firebase emulators:start --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "engines": {
    "node": "8"
  },
  "dependencies": {
    "@mollie/api-client": "^3.2.4",
    "axios": "^0.20.0",
    "cors": "^2.8.5",
    "dotenv": "^8.2.0",
    "firebase": "^7.16.0",
    "firebase-admin": "^8.10.0",
    "firebase-functions": "^3.6.1",
    "grpc": "^1.24.4"
  },
  "devDependencies": {
    "eslint": "^5.12.0",
    "eslint-plugin-promise": "^4.0.1",
    "firebase-functions-test": "^0.2.0"
  },
  "private": true
}

I cannot find anything specific to this problem. I am already using Firestore on my server side so there is no problem with initialization of Firebase. Maybe somebody knows where the problem might be or suggest something I should do to solve this. Thank you!

The closest link to this problem is https://github.com/googleapis/nodejs-datastore/issues/679 where still there is not answer.