This happens when using a custom server. I created a NextJS app with create-next-app with the latest version of next, and created a custom server.

server/index.ts

import express, { Application, Request, Response } from "express"
import { createServer } from "http"
import next from "next"
import url from "url"

const dev = process.env.NODE_ENV !== "production"
const nextApp = next({ dev })
const nextHandler = nextApp.getRequestHandler()

nextApp.prepare().then(() => {
    const app: Application = express()

    app.all("*", function handler(req: Request, res: Response) {
        const parsedUrl = url.parse(req.url, true)
        nextHandler(req, res, parsedUrl)
    })

    const server = createServer(app)

    try {
        const port = parseInt(process.env.PORT || "3000", 10)
        server.listen(port)
        console.log("Server listening on port", port)
    } catch (error) {
        console.log(error)
    }
})

When running yarn run dev, it executes the command nodemon. Here is the nodemon.json file:

nodemon.json

{
    "watch": ["server", "src", "shared"],
    "exec": "ts-node --project tsconfig.server.json server/index.ts",
    "ext": "js ts"
}

And here are the tsconfig files:
tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "strict": true,
    "noEmit": true,
    "esModuleInterop": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "jsx": "preserve",
    "incremental": true,
    "plugins": [
      {
        "name": "next"
      }
    ],
    "baseUrl": ".",
    "paths": {
      "@/*": ["./src/*"]
    }
  },
  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
  "exclude": ["node_modules"],
  "ts-node": {
    "transpileOnly": true,
    // "swc": true
  }
}

tsconfig.server.json

{
    "extends": "./tsconfig.json",
    "compilerOptions": {
      "module": "commonjs",
      "outDir": "dist",
      "target": "es2019",
      "isolatedModules": false,
      "noEmit": false,
    },
    "include": [
      "server/**/*.ts",
    ]
}