Minimal repro of nestjs bug

Found here: nestjs/nest#13401

Instructions

1. Clone this repo
2. pnpm install
3. docker-compose up -d
4. pnpm start:dev
5. Open http://localhost:3000/graphql in your browser
6. Make the follow query

query Testing($testingId: Int!) {
  testing(id: $testingId) {
    exampleField
  }
}

With variables:

{
  "testingId": 123
}

7. Observe error:

[Nest] 14121  - 06/17/2024, 7:08:22 PM   ERROR [ExceptionsHandler] Using global EntityManager instance methods for context specific actions is disallowed. If you need to work with the global instance's identity map, use `allowGlobalContext` configuration option or `fork()` instead.
ValidationError: Using global EntityManager instance methods for context specific actions is disallowed. If you need to work with the global instance's identity map, use `allowGlobalContext` configuration option or `fork()` instead.