Error: You cannot use both an required and optional catch-all route

Link to the code that reproduces this issue

https://github.com/imCorfitz/next-modal-issue-example

To Reproduce

Set up a Next.js app using intercepted parallel routes as per the example: https://github.com/vercel/nextgram
Assume you are building a site fully managed from a headless CMS, and move the root page.tsx file to a catch-all route e.g. app/[[...params]]/page.tsx
Create a page.tsx file in app/photos folder export default function Page() { return <div>All Photos here</div>; } (we could also add params logic to the catch all route, but this is simpler for testing).
Add a link to the modal linking to all photos - <Link href="/photos'>All photos</Link>
Test link.. Result: Modal remains open when navigating to the photos route.
Read and follow documentation telling us to create a [...catchall] route in the @modal directory, with a page that returns null
See error: Failed to reload dynamic routes: Error: You cannot use both an required and optional catch-all route at the same level ("[...catchall]" and "[[...params]]" ).

Current vs. Expected behavior

I believe this is to be expected - however an alternative approach or solution to closing the modal on navigation is needed in that case.

Provide environment information

Node.js v22.5.1

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 23.5.0: Wed May  1 20:12:58 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6000
  Available memory (MB): 65536
  Available CPU cores: 10
Binaries:
  Node: 22.5.1
  npm: 10.8.2
  Yarn: 1.22.22
  pnpm: N/A
Relevant Packages:
  next: 14.2.5 // Latest available version is detected (14.2.5).
  eslint-config-next: N/A
  react: 18.3.1
  react-dom: 18.3.1
  typescript: N/A
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Parallel & Intercepting Routes

Which stage(s) are affected? (Select all that apply)

next dev (local), next build (local), next start (local)

Additional context

No response

vercel / next.js

Error: You cannot use both an required and optional catch-all route #68932