Next.js App Router でサーバーコンポーネントから dynamic ssr:false が使えない

$ cat app/page.js
import dynamic from "next/dynamic";
 
const Chart = dynamic(() => import("./_components/Chart"), { ssr: false });
 
export default function Page() {
  return <Chart />;
}

$ npx next build
▲ Next.js 15.5.26
 
   Creating an optimized production build ...
Failed to compile.
 
./app/page.js
Error:   x `ssr: false` is not allowed with `next/dynamic` in Server Components. Please move it into a Client Component.
   ,-[/tmp/tmp.WpiXADqbG1/app/page.js:3:1]
 1 | import dynamic from "next/dynamic";
 2 | 
 3 | const Chart = dynamic(() => import("./_components/Chart"), { ssr: false });
   :               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 4 | 
 5 | export default function Page() {
 6 |   return <Chart />;
   `----
 
Import trace for requested module:
./app/page.js
 
> Build failed because of webpack errors
$ echo $?
1

$ cat app/page.js
import ChartClient from "./_components/ChartClient";
 
export default function Page() {
  return <ChartClient />;
}

$ npx next build
▲ Next.js 15.5.26
 
   Creating an optimized production build ...
 ✓ Compiled successfully in 2.2s
   Linting and checking validity of types ...
   Collecting page data ...
   Generating static pages (0/4) ...
   Generating static pages (1/4) 
   Generating static pages (2/4) 
   Generating static pages (3/4) 
 ✓ Generating static pages (4/4)
   Finalizing page optimization ...
   Collecting build traces ...
 
Route (app)                                 Size  First Load JS
┌ ○ /                                    1.25 kB         104 kB
└ ○ /_not-found                            992 B         104 kB
+ First Load JS shared by all             103 kB
  ├ chunks/255-2dbbf79f36f0dfa2.js       46.4 kB
  ├ chunks/4bd1b696-c023c6e3521b1417.js  54.2 kB
  └ other shared chunks (total)          1.94 kB
 
○  (Static)  prerendered as static content
$ echo $?
0

$ cat app/page.js
import { Suspense, lazy } from "react";
 
const Chart = lazy(() => import("./_components/Chart"));
 
export default function Page() {
  return (
    <Suspense fallback={<p>loading...</p>}>
      <Chart />
    </Suspense>
  );
}

$ npx next build
▲ Next.js 15.5.26
 
   Creating an optimized production build ...
 ✓ Compiled successfully in 2.1s
   Linting and checking validity of types ...
   Collecting page data ...
   Generating static pages (0/4) ...
   Generating static pages (1/4) 
   Generating static pages (2/4) 
   Generating static pages (3/4) 
 ✓ Generating static pages (4/4)
   Finalizing page optimization ...
   Collecting build traces ...
 
Route (app)                                 Size  First Load JS
┌ ○ /                                      255 B         103 kB
└ ○ /_not-found                            992 B         103 kB
+ First Load JS shared by all             102 kB
  ├ chunks/255-2dbbf79f36f0dfa2.js       46.4 kB
  ├ chunks/4bd1b696-c023c6e3521b1417.js  54.2 kB
  └ other shared chunks (total)          1.88 kB
 
○  (Static)  prerendered as static content
$ echo $?
0

// app/_components/ChartClient.tsx
"use client";
import dynamic from "next/dynamic";
 
const Chart = dynamic(() => import("./Chart"), { ssr: false });
 
export default function ChartClient(props: ChartProps) {
  return <Chart {...props} />;
}

// app/dashboard/page.tsx (Server Component)
import ChartClient from "../_components/ChartClient";
 
export default function Page() {
  return <ChartClient data={...} />;
}

import { Suspense, lazy } from "react";
 
const Heavy = lazy(() => import("./Heavy"));
 
export default function Page() {
  return (
    <Suspense fallback={<Spinner />}>
      <Heavy />
    </Suspense>
  );
}