prisma: MongoDB "Cannot create namespace" on Mongo 4.2

Bug description

Since I could not get the Prisma MongoDB tutorial working with the DB provided, I used an existing Atlas instance which has Replica Sets configured. I even created a collection in case Prisma was unable to create a collection (blog). However, on first run through of index.ts on the “create post” instance, Prisma failed with the following error:

PrismaClientUnknownRequestError2 [PrismaClientUnknownRequestError]: 
Invalid `prisma.post.create()` invocation in
/Users/ali/Documents/Work/ViaVid/Prisma/blog/index.ts:9:21

   6 await prisma.$connect()
   7 
   8 // Create the first post
→  9 await prisma.post.create(
  Error occurred during query execution:
ConnectorError(ConnectorError { user_facing_error: None, kind: RawError { code: "263", message: "Cannot create namespace dev101.Post in multi-document transaction." } })
    at cb (/Users/ali/Documents/Work/ViaVid/Prisma/blog/node_modules/@prisma/client/runtime/index.js:34804:17)
    at processTicksAndRejections (internal/process/task_queues.js:97:5) {
  clientVersion: '2.27.0'
}

How to reproduce

1. Change MongoDB to using a DB with a replica set
2. Run everything as per the example
3. npx ts-node index.ts

Expected behavior

Expected posts to write to DB and to have them listed.

Prisma information

// We want to connect to the MongoDB datasource
datasource db {
  provider = "mongodb"
  url      = env("DATABASE_URL")
}

// We want to generate a typescript client
// Since mongodb is a preview feature, we'll enable that.
generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["mongodb"]
}

// Create our post schema. All posts have a title, slug and body.
// The id attributes tell Prisma it's a primary key and to generate 
// object ids by default when we insert posts.
model Post {
  id    String @id @default(dbgenerated()) @map("_id") @db.ObjectId
  slug  String @unique
  title String
  body  String
}

Environment & setup

• OS: MacOSX 11.4
• Database: MongoDB 4.2.15, DB dev101 collection (pre-created manually) blog
• Node.js version: 14.17.3

Prisma Version

2.27.0