Catch-all as a fallback in app router

[jackhugh]

I’ve run into something with the App Router that doesn’t seem possible, even though it worked fine with the Pages Router.

Example setup:

• Route A: /[segment]/[...slug]/page.tsx
• Route B: /[...slug]/page.tsx

The problem is that in the App Router, Route A always takes priority. That means any path matching /*/* is intercepted by Route A - even if I haven’t declared that route in generateStaticParams and have set dynamicParams = false.

What’s even stranger is that Route B does intercept the route on the very first load after starting the server, but will use Route A subsequently (until the server is restarted).