Next 13.4.10 - If slug doesn't exist NotFound() not working and returns server errors.

[Galanthus]

Hopefully, someone can help me out. Yesterday upgraded to the latest Next 13.4.10 version. Normally if a slug doesn't exist it returns the NotFound() function and shows me the error page.

Console log always returns null if there is no page which is fine. in the previous version.

With it's latest version the page returns the following error and doesn't redirect to the 404 page, this happend to all routes on the website if it doesn't exist.

^[Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.
Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: null.
Error: Unsupported Server Component type: Null
    at attemptResolveElement (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:1421:19)
    at resolveModelToJSON (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:1627:41)
    at Object.toJSON (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:1169:28)
    at stringify (<anonymous>)
    at processModelChunk (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:2116:24)
    at retryTask (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:1882:38)
    at performWork (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:1920:21)
    at Timeout.eval [as _onTimeout] (webpack-internal:///(sc_server)/./node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js:1429:28)
    at listOnTimeout (node:internal/timers:569:17)
    at process.processTimers (node:internal/timers:512:7) {
  digest: '135229182'
}

Reverting back to the previous Next version I don't get to see this error.

[markudevelop]

This seems like a next.js issue maybe we should open an issue there