Upon creating a new app with npx create-next-app@latest, running npm run dev produces the following errors:

(See image)
Also, in the console for localhost:3000:

(Note the path for Documents and udemy_next are appended together, which seems incorrect.

Uncaught Error: Could not find the module "C:\Users\MyUsername\Documentsudemy_next\my_app\node_modules\next\dist\client\components\app-router.js#default" in the React Client Manifest. This is probably a bug in the React Server Components bundler.
    at resolveClientReferenceMetadata (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:327:27)
    at serializeClientReference (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:1510:47)
    (truncated for length)
server.edge.development.js:1429:28)
    at listOnTimeout (node:internal/timers:569:17)
    at process.processTimers (node:internal/timers:512:7)

This also seems to have been experienced by others:
https://github.com/vercel/next.js/issues/52817
https://stackoverflow.com/questions/76244354/while-selecting-app-router-yes-in-next-js-13-while-installing-through-npx-crea/76725424#76725424
Though no clear answer seems to exist.

This error doesn't occur when selecting to NOT use the app router.

Running up to date Windows 11, Node v18.17.0, npm v9.8.0