first commit

test/e2e/app-dir/navigation/app/assertion/page/page.js

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+import { strict as assert } from 'node:assert'
+import Link from 'next/link'
+import { NEXT_RSC_UNION_QUERY } from 'next/dist/client/components/app-router-headers'
+
+export default async function Page({ searchParams }) {
+  const rscUnionQuery = (await searchParams)[NEXT_RSC_UNION_QUERY]
+  assert(rscUnionQuery === undefined)
+
+  return (
+    <>
+      <p>no rsc query page</p>
+      return{' '}
+      <Link id="link-to-pages" href="/some">
+        To /some
+      </Link>
+    </>
+  )
+}

test/e2e/app-dir/navigation/app/assertion/route/route.js

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+import { strict as assert } from 'node:assert'
+import { NEXT_RSC_UNION_QUERY } from 'next/dist/client/components/app-router-headers'
+
+export function GET(request) {
+  assert(request.nextUrl.searchParams.get(NEXT_RSC_UNION_QUERY) === null)
+  return new Response('no rsc query route')
+}