Socket.io Gateway does send events, if method returns WsReponse object

Is there an existing issue for this?

[X] I have searched the existing issues

Current behavior

I'm evaluating NestJS for our next socket.io Project. Therefore i cloned the official sample here: https://github.com/nestjs/nest/tree/master/sample/02-gateways

I've observed, that the server only responds to the identity event and not to the events event. I've added some console.logs and found out that the method is triggered correctly, but the given Response in form of an observable is not emitted at all.

Minimum reproduction code

https://github.com/nestjs/nest/tree/master/sample/02-gateways

Steps to reproduce

Clone the official sample here: https://github.com/nestjs/nest/tree/master/sample/02-gateways
Update all nestjs dependencies to 10.2.5
Start server npm run start:debug
Serve client `npx static-server . --port 1337``
Open client example in browser http://localhost:1337
Open console and see for yourself. The server only responds to the identity-event, which is implemented with a Promise. The server does not respond to events, which is implemented using an Observable<WsResponse>.

Expected behavior

The event events should be emitted three times, with the appropriate payloads (1, 2, 3).

Package

[ ] I don't know. Or some 3rd-party package
[ ] code>@nestjs/common</code
[ ] code>@nestjs/core</code
[ ] code>@nestjs/microservices</code
[ ] code>@nestjs/platform-express</code
[ ] code>@nestjs/platform-fastify</code
[X] code>@nestjs/platform-socket.io</code
[ ] code>@nestjs/platform-ws</code
[ ] code>@nestjs/testing</code
[ ] code>@nestjs/websockets</code
[ ] Other (see below)

Other package

No response

NestJS version

10.2.5

Packages versions

{
  "name": "nest-typescript-starter",
  "version": "1.0.0",
  "description": "Nest TypeScript starter repository",
  "license": "MIT",
  "scripts": {
    "prebuild": "rimraf dist",
    "build": "nest build",
    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
    "start": "nest start",
    "start:dev": "nest start --watch",
    "start:debug": "nest start --debug --watch",
    "start:prod": "node dist/main",
    "lint": "eslint '{src,apps,libs,test}/**/*.ts' --fix",
    "test": "jest",
    "test:watch": "jest --watch",
    "test:cov": "jest --coverage",
    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
    "test:e2e": "jest --config ./e2e/jest-e2e.json"
  },
  "dependencies": {
    "@nestjs/common": "10.2.5",
    "@nestjs/core": "10.2.5",
    "@nestjs/platform-express": "10.2.5",
    "@nestjs/platform-socket.io": "10.2.5",
    "@nestjs/websockets": "10.2.5",
    "@socket.io/redis-adapter": "8.2.1",
    "class-transformer": "0.5.1",
    "class-validator": "0.14.0",
    "reflect-metadata": "0.1.13",
    "rimraf": "5.0.1",
    "rxjs": "7.8.1",
    "socket.io": "4.7.2"
  },
  "devDependencies": {
    "@nestjs/cli": "10.1.17",
    "@nestjs/schematics": "10.0.2",
    "@nestjs/testing": "10.2.5",
    "@types/express": "4.17.17",
    "@types/jest": "29.5.4",
    "@types/node": "20.6.0",
    "@types/supertest": "2.0.12",
    "@types/ws": "8.5.5",
    "@typescript-eslint/eslint-plugin": "6.6.0",
    "@typescript-eslint/parser": "6.6.0",
    "eslint": "8.49.0",
    "eslint-config-prettier": "9.0.0",
    "eslint-plugin-import": "2.28.1",
    "jest": "29.6.4",
    "prettier": "3.0.3",
    "redis": "4.6.8",
    "supertest": "6.3.3",
    "ts-jest": "29.1.1",
    "ts-loader": "9.4.4",
    "ts-node": "10.9.1",
    "tsconfig-paths": "4.2.0",
    "typescript": "5.2.2"
  },
  "jest": {
    "moduleFileExtensions": [
      "js",
      "json",
      "ts"
    ],
    "rootDir": "src",
    "testRegex": ".*\\.spec\\.ts$",
    "transform": {
      "^.+\\.(t|j)s$": "ts-jest"
    },
    "collectCoverageFrom": [
      "**/*.(t|j)s"
    ],
    "coverageDirectory": "../coverage",
    "testEnvironment": "node"
  }
}

Node.js version

18.16.0

In which operating systems have you tested?

[X] macOS
[ ] Windows
[ ] Linux

Other