Next13.4 appDir does not render layout and template in the way the docs say it should

Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
      Platform: darwin
      Arch: arm64
      Version: Darwin Kernel Version 22.4.0: Mon Mar  6 20:59:58 PST 2023; root:xnu-8796.101.5~3/RELEASE_ARM64_T6020
    Binaries:
      Node: 18.16.0
      npm: 9.5.1
      Yarn: 1.22.19
      pnpm: N/A
    Relevant packages:
      next: 13.4.2-canary.4
      eslint-config-next: 13.4.1
      react: 18.2.0
      react-dom: 18.2.0
      typescript: 5.0.4

Which area(s) of Next.js are affected? (leave empty if unsure)

App directory (appDir: true), Routing (next/router, next/navigation, next/link)

Link to the code that reproduces this issue

https://codesandbox.io/p/sandbox/wizardly-wing-fj1kod

To Reproduce

Download and run the files in the sandbox (so that you can attach the React Developer Tools)

Note that in the react developer tools, the following component tree is rendered, showing the top Suspense added by the layout.tsx, two Next internal components, and then the Suspense from the template.tsx:

Describe the Bug

The NextJS Documentation on templates in the app-directory router here says that layouts and templates will be rendered as such:

<Layout>
  {/* Note that the template is given a unique key. */}
  <Template key={routeParam}>{children}</Template>
</Layout>

However, in practice we can clearly see that NextJS inserts a component called OuterLayoutRouter between each layout-template pair, separating the layout from the part of the Template framework that receives the unique key promised by the docs.

This means that components that rely on