Laravel how do laravel sessions work?

Question

Laravel

Why if you first execute such code And then it displays null and not the word test
session()->put(['test' = 'test'])
dd(session()->get('test))

Answer 1

Don't use dd, it kills request processing and session writing doesn't work
Proofs:
https://github.com/laravel/docs/pull/3376
https://laracasts.com/discuss/channels/laravel/is-...