[Pages Router] - Middleware breaks URL masking

### Link to the code that reproduces this issue or a replay of the bug https://codesandbox.io/p/github/ValenCassa/bug-next/main?file=/middleware.ts:1,1 ### To Reproduce 1. Start the application in development 2. Click on the link 3. Remove the middleware file 4. Try again ### Current vs. Expected behavior **Current behavior**: When using middleware, the link redirects you to whatever the `as` prop has been set to instead of browsing to the `href` and masking the URL. **Expected behavior**: The link should should browse to the `href` and mask the URL based on the `as` prop. ### Verify canary release - [X] I verified that the issue exists in the latest Next.js canary release ### Provide environment information ```bash Operating System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 22.5.0: Mon Apr 24 20:40:17 PDT 2023; root:xnu-8796.121.2~3/RELEASE_ARM64_T8112 Binaries: Node: 20.5.0 npm: 9.8.0 Yarn: N/A pnpm: N/A Relevant Packages: next: 13.4.20-canary.23 eslint-config-next: N/A react: 18.2.0 react-dom: 18.2.0 typescript: 5.1.3 Next.js Config: output: N/A ``` ### Which area(s) are affected? (Select all that apply) Middleware / Edge (API routes, runtime), Routing (next/router, next/navigation, next/link) ### Additional context I spent several hours trying to debug what was causing the issue and was going crazy. It seems the `nextUrl` from the request object is returning the pathname as `/test/1?id=1`, so it's actually appending both whatever you're using for the `as` prop and the `href`. I tried setting the pathname manually too with no success.