Middlewares are not applied to default fallback handler

[imRentable]

Describe the bug
Hi, I am unsure whether this is a bug or rather a lacking feature but I noticed that my middlewares are not taken into account if none of my routes were "hit". I.e. if a 404 occurs. To fix this, I have to add my own fallback/wildcard route. See this Scala CLI example:

//> using dep "dev.zio::zio:2.0.18"
//> using dep "dev.zio::zio-http:3.0.1"

import zio._
import zio.http._

object Demo extends ZIOAppDefault {

  val route: Route[Any, Nothing] =
    Method.GET / "foo" -> handler(Response.text("hi"))
  val routes = route.toRoutes @@ Middleware.debug

  val fallback = Route.notFound.toRoutes
  val routesWithManualFallback = route.toRoutes ++ fallback @@ Middleware.debug

  override def run: ZIO[ZIOAppArgs & Scope, Any, Any] =
    val found = Request.get("/foo")
    val notFound = Request.get("/bar")

    // won't apply the debug middleware
    routes.run(notFound).debug *>
      // will apply the debug middleware
      routesWithManualFallback.run(notFound).debug
}

Interestingly, the documentation of zio.http.RoutePattern#any (which is used in zio.http.Route#notFound) states

It is unlikely you need to use this pattern (...)

Therefore, either I am doing it wrong or this is not the intended behaviour.

Expected behaviour
Middlewares are also applied if none of the created routes have been hit.