next/dynamic from external package causes hydration errors for combination of pages and app routers

### Link to the code that reproduces this issue https://github.com/adanperez/nextjs-dynamic-hydration-error ### To Reproduce - `pnpm run build` - `pnpm run start` - Go to http://localhost:3000/ and refresh the page a couple times You will see the following Hydration errors in the console. ``` framework-5e252d5045bb7a0e.js:9 Uncaught Error: Minified React error #418; visit https://reactjs.org/docs/error-decoder.html?invariant=418 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at ly (framework-5e252d5045bb7a0e.js:9:46791) at framework-5e252d5045bb7a0e.js:9:99911 at oD (framework-5e252d5045bb7a0e.js:9:106131) at oO (framework-5e252d5045bb7a0e.js:9:99079) at framework-5e252d5045bb7a0e.js:9:98886 at oF (framework-5e252d5045bb7a0e.js:9:98893) at oS (framework-5e252d5045bb7a0e.js:9:93932) at x (framework-5e252d5045bb7a0e.js:33:1364) at MessagePort.T (framework-5e252d5045bb7a0e.js:33:1894) framework-5e252d5045bb7a0e.js:9 Uncaught Error: Minified React error #423; visit https://reactjs.org/docs/error-decoder.html?invariant=423 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at i (framework-5e252d5045bb7a0e.js:9:120721) at oO (framework-5e252d5045bb7a0e.js:9:99019) at framework-5e252d5045bb7a0e.js:9:98886 at oF (framework-5e252d5045bb7a0e.js:9:98893) at ox (framework-5e252d5045bb7a0e.js:9:95645) at oS (framework-5e252d5045bb7a0e.js:9:94200) at x (framework-5e252d5045bb7a0e.js:33:1364) at MessagePort.T (framework-5e252d5045bb7a0e.js:33:1894) ``` ### Current vs. Expected behavior ### Current Currently we get hydration errors when using a `next/dynamic` component from an external package. ### Expected We do not expect to get hydration errors. If you remove the `app` directory and rebuild and start the app, you will no longer see hydration errors. The combination of `pages` and `app` directories causes the hydration error. …