I have created a middleware.ts file inside my src directory.

export const config = {
  matcher: "/a/:path*"
} as MiddlewareConfig


export default function middleware(request: NextRequest) {
  console.log(request.url)
}

I'm on nextjs 15.3. When i run next dev my middleware is triggered for all routes. Not just /a/

Feels like a bug? Or I'm totally misunderstanding something here