[Bug]: Pathless route broke action [tutorial broken]

[webartoli]

What version of React Router are you using?

6.4.2

Steps to Reproduce

⚠️ This issue affect the main tutorial ⚠️

User that gave React Router a shot are effected by this.

Following main tutorial all works well until Pathless Route.

Adding a pathless route as described, the New button no longer works.

Steps

• Create a root path with an action
• Add pathless children
• trigger root action

Expected Behavior

parent action rootAction is detected via pathless routes.

In the tutorial, pressing new button the action is detected.

Actual Behavior

I got a console.warn message:

You're trying to submit to a route that does not have an action.  To fix this, please add an `action` function to the route for [/]

And an error response

ErrorResponse {
  status: 405, 
  statusText: 'Method Not Allowed', 
  data: 'No action found for [/]'
}

[timdorr]

Duplicate of #9284

This will be fixed in 6.4.3.