Because NX has lots of issues and is under heavy development. So stop ripping your hair out and just do it the old fashioned way.
Install nvs
https://github.com/jasongin/nvs
nvs use `cat .nvsrc`
create the backend server
nest new api
$ cd api
$ pnpm run start
# or
$ nest start
create the frontend client
ng new app
$ cd app
$ pnpm run start
# or
$ ng serve