Sign up shows no flash message when trying to sign up with already available email

[gobijan]

Steps to reproduce:

1. Create a vanilla app with Rails 7.0.3 e.g: rails new vanillaapp
2. Setup clearance including the setup instructions (add flashes to application.html.erb etc.)
3. Run app and sign up with mail@example.com and test1345
4. Log out and try to sign up again with mail@example.com and test1345

Expected:
See a flash that tells the user that the registration attempt failed.

Actual:
No feedback. Sign up form just gets rerendered.