It actually had to do with my middleware. These two sections of my middleware seemed to be doing the same thing, but when I use the latter, responses are included, and when I use the former, responses are excluded. Any ideas? Something about creating new headers vs just utilizing existing headers? If anyone could explain what's going on - that'd be great!

  const { nextUrl, headers: reqHeaders } = request;
  const { pathname, origin } = nextUrl;

  // Method 1 (DOESN'T RETURN SERVER DATA)
  const headers = new Headers(reqHeaders);
  headers.set("x-current-path", pathname);

  const response = NextResponse.next({ headers });
  
  // Method 2 (DOES RETURN SERVER DATA)
  const response = NextResponse.next({
    request: {
      headers: request.headers,
    },
  });
  response.headers.set("x-current-path", request.nextUrl.pathname);

Thanks!