Svelte island does not expect unknown props, causes warning

[nikhilk]

Astro Info

Astro                    v4.0.7
Node                     v20.10.0
System                   macOS (arm64)
Package Manager          npm
Output                   static
Adapter                  none
Integrations             @astrojs/svelte
                         @astrojs/tailwind

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

No response

Describe the Bug

I have a very simple counter svelte component included into an Astro component.

When viewing the page after running "astro dev", I see the following warning in the console.

<Counter> was created with unknown prop 'data-astro-cid-j7pv25f6'

I see this is a warning generated from the stackblitz sample for Svelte as well (linked as reproducible example)

What's the expected result?

Ideally this warning should not appear, as it adds noise to the console. With a warning per component, this can easily make the experience poor.

Link to Minimal Reproducible Example

https://stackblitz.com/github/withastro/astro/tree/latest/examples/framework-svelte?file=src%2Fcomponents%2FCounter.svelte

Participation

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

[Indyandie]

😌 Phew… I'm glad I found this! I thought it had something to do with one of my dependencies.

Card.svelte:82 <Card> was created with unknown prop 'data-astro-cid-bqi7seht'

I'm in the of upgrading to astro 4