Problem testing with `firebase.firestore.FieldValue.serverTimestamp()`

[VictorUvarov]

I migrated over from @firebase/testing to @firebase/rules-unit-testing and now all of my tests that use firebase.firestore.FieldValue.serverTimestamp() are failing.

Articles collection
       Should allow an admin to update an article:
     Error: Value for argument "data" is not a valid Firestore document. Detected an object of type "FieldValue" that doesn't match the expected instance (found in field "created_at"). Please ensure that the Firestore types you are using are from the same NPM package.)
      at validateUserInput (node_modules/@google-cloud/firestore/build/src/serializer.js:332:15)
      at Object.validateUserInput (node_modules/@google-cloud/firestore/build/src/serializer.js:269:13)
      at validateDocumentData (node_modules/@google-cloud/firestore/build/src/write-batch.js:588:18)
      at WriteBatch.set (node_modules/@google-cloud/firestore/build/src/write-batch.js:247:9)
      at Transaction.set (node_modules/@google-cloud/firestore/build/src/transaction.js:178:26)
      at /Users/victoruvarov/work/tive/tive-backend/test/articles_collection.spec.js:216:19
      at Transaction.runTransaction (node_modules/@google-cloud/firestore/build/src/transaction.js:333:33)
      at async Context.<anonymous> (test/articles_collection.spec.js:215:5)

imports

const firebase = require("@firebase/rules-unit-testing");
const fs = require("fs");
const http = require("http");

dependencies

"devDependencies": {
    "@firebase/rules-unit-testing": "^1.3.13",
    "firebase-admin": "^9.11.0",
    "firebase-tools": "^9.16.0",
    "mocha": "^8.4.0"
  }