Fragment + nested client:only components + slots problem

[comus]

Astro Info

Astro                    v4.3.2
Node                     v18.18.0
System                   macOS (arm64)
Package Manager          npm
Output                   hybrid
Adapter                  @astrojs/vercel/serverless
Integrations             @astrojs/tailwind
                         @astrojs/react
                         simple-stream

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

below is the "not working" case, which is webpage display nothing.

---
import { Hello, Island, World } from "@components/demo.tsx";
---

<Island client:only>
  <Fragment slot="footer"><Hello client:only /></Fragment>
  <Fragment slot="header"><World client:only /></Fragment>
</Island>

but, if don't use Fragment, it works

<Island client:only>
  <a slot="footer"><Hello client:only /></a>
  <a slot="header"><World client:only /></a>
</Island>

also, below is work if nested components not defined client:only

<Island client:only>
  <Fragment slot="footer"><Hello /></Fragment>
  <Fragment slot="header"><World /></Fragment>
</Island>

What's the expected result?

I expected this should work

<Island client:only>
  <Fragment slot="footer"><Hello client:only /></Fragment>
  <Fragment slot="header"><World client:only /></Fragment>
</Island>

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-qczw9r-srdto2?file=src%2Fpages%2Findex.astro

Participation

• I am willing to submit a pull request for this issue.

[Kanha-Dehury-01]

Nesting client:only directives can cause issues with rendering components on the server. Since the Island component is marked with client:only, any nested components with the same directive will also be skipped during server-side rendering. This can lead to empty content being displayed initially before the browser hydrates the components.

Instead of applying client:only to the Island component, move it to the individual components to render conditionally. This approach ensures that only the Hello and World components are skipped during server-side rendering, while the Island component itself is still rendered on the server.

<Island>
  <Fragment slot="footer"><Hello client:only /></Fragment>
  <Fragment slot="header"><World client:only /></Fragment>
</Island>

We can also use react-hydration